NORTHBROOK VARIABLE ANNUITY ACCOUNT II
485APOS, 1997-02-28
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<PAGE>

   
   AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON FEBRUARY 28, 1997
    

                                                               FILE NO. 33-35412
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
 
                            ------------------------
 
                                    FORM N-4
 
            REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933
 
                                                                             /X/
   
                        POST-EFFECTIVE AMENDMENT NO. 14
    
 
                                     AND/OR
 
        REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940
 

                                                                             /X/
   
                                AMENDMENT NO. 15
    
 
                            ------------------------
 
                     NORTHBROOK VARIABLE ANNUITY ACCOUNT II
 
                           (Exact Name of Registrant)
 
                       NORTHBROOK LIFE INSURANCE COMPANY
 
                              (Name of Depositor)
 

                               MICHAEL J. VELOTTA
                 VICE PRESIDENT, SECRETARY AND GENERAL COUNSEL
                       NORTHBROOK LIFE INSURANCE COMPANY
                               3100 SANDERS ROAD
                           NORTHBROOK, ILLINOIS 60062
                                  847/402-2400
                (Name and Complete Address of Agent for Service)

 
                            ------------------------
 

                                   COPIES TO:

     GREGOR B. MCCURDY, ESQUIRE            CHRISTINE A. EDWARDS, ESQUIRE
      ROUTIER AND JOHNSON, P.C.              DEAN WITTER REYNOLDS INC.
   1700 K STREET, N.W., SUITE 1003            TWO WORLD TRADE CENTER
       WASHINGTON, D.C. 20006                NEW YORK, NEW YORK 10048

 
                            ------------------------
 

                        STATEMENT PURSUANT TO RULE 24F-2

 
   
    Pursuant  to  Rule  24f-2 under  the  Investment  Company Act  of  1940, the
Registrant hereby states that, pursuant to  paragraph (b)(1), it filed its  Rule
24f-2 Notice for the fiscal year ending December 31, 1996 on February 28, 1997.
    
 
                            ------------------------
 

 IT IS PROPOSED THAT THIS FILING WILL BECOME EFFECTIVE (CHECK APPROPRIATE BOX)

        ___ immediately upon filing pursuant to paragraph (b) of Rule 485
   
        ___ on (date) pursuant to paragraph (b) of Rule 485
    
        ___ 60 days after filing pursuant to paragraph (a)(i) of Rule 485
   
        _X_ on May 1, 1997 pursuant to paragraph (a)(i) of Rule 485
    

            IF APPROPRIATE, CHECK THE FOLLOWING BOX:



        __ This post-effective amendment designates a new effective date for a
           previously filed post-effective amendment.

 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>
                             CROSS REFERENCE SHEET
 
Showing  Location in Part A (Prospectus) and Part B of Registration Statement of
Information Required by Form N-4
   
<TABLE>
<CAPTION>
      ITEM OF
      FORM N-4                                                                                 PROSPECTUS CAPTION
- --------------------                                                             ----------------------------------------------
<S>        <C>        <C>        <C>                                             <C>
 1.        Cover Page..........................................................  Cover Page
 2.        Definitions.........................................................  Glossary
 3.        Synopsis............................................................  Introduction: Summary of Separate Account
                                                                                  Expenses
 4.        Condensed Financials................................................  --
           (a)        Chart....................................................  Condensed Financial Statements
           (b)        Performance Data.........................................  Performance Data
           (c)        Location of Others.......................................  Financial Statements
 5.        General.............................................................  --
           (a)        Depositor................................................  Northbrook Life Insurance Company
           (b)        Registrant...............................................  The Variable Account
           (c)        Portfolio Company........................................  Dean Witter Variable Investment Series
           (d)        Fund Prospectus..........................................  Dean Witter Variable Investment Series
           (e)        Voting Rights............................................  Voting Rights
           (f)        Administrators...........................................  Charges & Other Deductions -- Contract
                                                                                  Maintenance Charge
 6.        Deductions & Expenses...............................................  Charges & Other Deductions
           (a)        General..................................................  Charges & Other Deductions
           (b)        Sales Load %.............................................  Surrender Charge
           (c)        Special Purchase Plans...................................  N/A
           (d)        Commissions..............................................  Sales Commission
           (e)        Fund Expenses............................................  Summary of Expenses; Dean Witter Variable
                                                                                  Investment Series Expenses
           (f)        Organizational Expenses..................................  N/A
 7.        Contracts
           (a)        Persons with Rights......................................  The Contracts; Benefits; Income Payments;
                                                                                  Voting Rights; Assignments; Beneficiaries
                                                                                  Contract Owners
           (b)        (i)        Allocation of Purchase Payments...............  Allocation of Purchase Payments
                      (ii)       Transfers.....................................  Transfers
                      (iii)      Exchanges.....................................  N/A
           (c)        Changes..................................................  Modification
           (d)        Inquiries................................................  Customer Inquiries
 8.        Annuity Period......................................................  Income Payments
           (a)        Material Factors.........................................  Amount of Variable Annuity Income Payments
           (b)        Dates....................................................  Income Starting Date
           (c)        Frequency, duration & level..............................  Amount of Variable Annuity Income Payments
           (d)        AIR......................................................  Amount of Variable Annuity Income Payments
           (e)        Minimum..................................................  Amount of Variable Annuity Income Payments
           (f)        -- Change Options........................................  Income Plans
                      -- Transfer..............................................  --
 9.        Death Benefit.......................................................  Benefits Under the Contract
</TABLE>
    
<PAGE>
   
<TABLE>
<CAPTION>
      ITEM OF
      FORM N-4                                                                                 PROSPECTUS CAPTION
- --------------------                                                             ----------------------------------------------
10.        Purchases & Contract Value
<S>        <C>        <C>        <C>                                             <C>
           (a)        Purchases................................................  Purchase of the Contract; Crediting of
                                                                                  Purchase Payments
           (b)        Valuation................................................  Value of Variable Account Accumulation Units
           (c)        Daily Calculation........................................  Value of Variable Account Accumulation Units;
                                                                                  Allocation of Purchase Payments
           (d)        Underwriter..............................................  Dean Witter Reynolds Inc.
11.        Redemptions
           (a)        -- By Owners.............................................  Surrender & Withdrawals
           (b)        -- By Annuitant..........................................  Annuity Options
           (c)        Texas ORP................................................  N/A
           (d)        Lapse....................................................  Default
           (e)        Free Look................................................  Introduction
12.        Taxes...............................................................  Federal Tax Matters
13.        Legal Proceedings...................................................  N/A
14.        SAI Contents........................................................  SAI Table of Contents
15.        Cover Page..........................................................  SAI: Cover Page
16.        Table of Contents...................................................  SAI: Table of Contents
17.        General Information & History
           (a)        Depositor's Name.........................................  Northbrook Life Insurance Company
           (b)        Assets of Sub-Account....................................  The Variable Account
           (c)        Control of Depositor.....................................  Northbrook Life Insurance Company
18.        Services
           (a)        Fees & Expenses of Registrant............................  Contract Maintenance Charge
           (b)        Management Contracts.....................................  Contract Maintenance Charge; Sales Commissions
           (c)        Custodian                                                  SAI: Safekeeping of the Variable Account's
                                                                                  Assets
                      Independent Public Accountant............................  SAI: Experts
           (d)        Assets of Registrant.....................................  SAI: Safekeeping of the Variable Account
                                                                                  Assets
           (e)        Affiliated Persons.......................................  N/A
           (f)        Principal Underwriter....................................  Dean Witter Reynolds Inc.
19.        Purchase of Securities Being Offered
           (a)        Offering.................................................  SAI: Purchase of Contracts
           (b)        Sales load...............................................  SAI: Sales Commissions
20.        Underwriters
           (a)        Principal Underwriter....................................  N/A
           (b)        Continuous offering......................................  SAI: Purchase of Contracts
           (c)        Commissions..............................................  SAI: Sales Commissions; Dean Witter Reynolds
                                                                                  Inc.
           (d)        Unaffiliated Underwriters................................  N/A
21.        Calculation of Performance Data.....................................  SAI: Performance Data
22.        Annuity Payments....................................................  SAI; Income Payments
23.        Financial Statements
           (a)        Financial Statements of Registrant.......................  SAI; Northbrook Variable Annuity Account
                                                                                  Financial Statements
           (b)        Financial Statements of Depositor........................  SAI; Northbrook Life Insurance Company
                                                                                  Financial Statements
</TABLE>
    

<PAGE>
<TABLE>
<CAPTION>
      ITEM OF
      FORM N-4                                                                                 PROSPECTUS CAPTION
- --------------------                                                             ----------------------------------------------
24a.       Financial Statements................................................  Part C.  Financial Statements
<S>        <C>        <C>        <C>                                             <C>
24b.       Exhibits............................................................  Part C.  Exhibits
25.        Directors and Officers..............................................  Part C.  Directors & Officers of Depositor
26.        Persons Controlled By or Under Common Control
           with Depositor or Registrant........................................  Part C.  Persons Controlled by or Under Common
                                                                                  Control with Depositor or Registrant
27.        Number of Contract Owners...........................................  Part C.  Number of Contract Owners
28.        Indemnification.....................................................  Part C.  Indemnification
29a.       Relationship of Principal Underwriter to Other
           Investment Companies................................................  Part C.  Relationship of Principal Underwriter
                                                                                  to Other Investment Companies
29b.       Principal Underwriters..............................................  Part C.  Principal Underwriters
29c.       Compensation of Underwriter.........................................  Part C.  Compensation of Dean Witter
30.        Location of Accounts and Records....................................  Part C.  Location of Accounts and Records
31.        Management Services.................................................  Part C.  Management Services
32.        Undertakings........................................................  Part C.  Undertakings
</TABLE>
<PAGE>
                     NORTHBROOK VARIABLE ANNUITY ACCOUNT II
 
                                       of
 
                       NORTHBROOK LIFE INSURANCE COMPANY
                                 P.O. Box 94040
                         Palatine, Illinois 60094-4040
 
                GROUP AND INDIVIDUAL VARIABLE ANNUITY CONTRACTS
 
                                 Distributed By
 
                           Dean Witter Reynolds Inc.
                             Two World Trade Center
                            New York, New York 10048
 
                              -------------------
 
This Prospectus describes the group and individual Flexible Premium Deferred
Variable Annuity Contract ("Contract") offered by Northbrook Life Insurance
Company ("Company"), a wholly owned subsidiary of Allstate Life Insurance
Company. Dean Witter Reynolds Inc. ("Dean Witter") is the principal underwriter
and distributor of the Contracts. In certain states the Contract is only
available as a group Contract. In these states a Certificate (hereinafter
referred to as "Contract") is issued to customers of Dean Witter which
summarizes the provisions of the Master Group Policy issued to Dean Witter.
 
The Contract has the flexibility to allow you to shape an annuity to fit your
particular needs. It is primarily designed to aid you in long-term financial
planning and can be used for retirement planning regardless of whether the plan
qualifies for special federal income tax treatment.
 
This Prospectus is a concise statement of the relevant information about the
Northbrook Variable Annuity Account II ("Variable Account") which you should
know before making a decision to purchase the Contract. This Prospectus
generally describes only the variable portion of the Contract. For a brief
summary of the fixed portion of the Contract, see "The Fixed Account" on page
19.
 
The Variable Account invests exclusively in shares of the Dean Witter Variable
Investment Series (the "Fund"), a mutual fund managed by Dean Witter
InterCapital Inc., a wholly owned subsidiary of Dean Witter, Discover & Co.
   
The Company has prepared and filed a Statement of Additional Information dated
May 1, 1997, with the U.S. Securities and Exchange Commission. If you wish to
receive the Statement of Additional Information, you may obtain a free copy by
calling or writing the Company at the address below. For your convenience, an
order form for the Statement of Additional Information may be found on page 25
of this Prospectus. Before ordering, you may wish to review the Table of
Contents of the Statement of Additional Information on page 24 of this
Prospectus. The Statement of Additional Information has been incorporated by
reference into this Prospectus.
    
 
                       Northbrook Life Insurance Company
                                 P.O. Box 94040
                         Palatine, Illinois 60094-4040
                                 (800) 654-2397
 
                 This Prospectus is Valid Only When Accompanied
                  or Preceded By A Current Prospectus For The
                     Dean Witter Variable Investment Series
 
  THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
      EXCHANGE COMMISSION, NOR HAS THE COMMISSION PASSED UPON THE ACCURACY
           OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE
                        CONTRARY IS A CRIMINAL OFFENSE.
 
    PLEASE READ THIS PROSPECTUS CAREFULLY AND RETAIN IT FOR FUTURE REFERENCE
   
                  The Date of This Prospectus is May 1, 1997.
    
<PAGE>
The Contracts are available in all states (except New York), Puerto Rico and the
                             District of Columbia.
 
THIS PROSPECTUS DOES NOT CONSTITUTE AN OFFERING IN ANY JURISDICTION IN WHICH
SUCH OFFERING MAY NOT LAWFULLY BE MADE. NO DEALER, SALESMAN, OR OTHER PERSON IS
AUTHORIZED TO GIVE ANY INFORMATION OR MAKE ANY REPRESENTATIONS IN CONNECTION
WITH THIS OFFERING OTHER THAN THOSE CONTAINED IN THIS PROSPECTUS, AND, IF GIVEN
OR MADE, SUCH OTHER INFORMATION OR REPRESENTATIONS MUST NOT BE RELIED UPON.
 
                               TABLE OF CONTENTS
 
   
Glossary....................................................      3
Introduction................................................      5
Summary of Separate Account Expenses........................      7
Condensed Financial Information.............................      9
Performance Data............................................     11
Financial Statements........................................     11
Northbrook Life Insurance Company and the Variable
 Account....................................................     11
  Northbrook Life Insurance Company.........................     11
  Dean Witter Reynolds Inc..................................     11
  The Variable Account......................................     12
  Dean Witter Variable Investment Series....................     12
The Contracts...............................................     13
  Purchase of the Contracts.................................     13
  Crediting of Initial Purchase Payments....................     13
  Allocation of Purchase Payments...........................     13
  Value of Variable Account Accumulation Units..............     14
  Transfers.................................................     14
  Surrender and Withdrawals.................................     15
  Default...................................................     15
Charges and Other Deductions................................     15
  Deductions from Purchase Payments.........................     15
  Early Withdrawal Charge...................................     15
  Contract Maintenance Charge...............................     16
  Administrative Expense Charge.............................     16
  Mortality and Expense Risk Charge.........................     16
  Taxes.....................................................     17
  Dean Witter Variable Investment Series Expenses...........     17
Benefits Under the Contract.................................     17
  Death Benefits Prior to the Payout Start Date.............     17
  Death Benefits After the Payout Start Date................     18
Income Payments.............................................     18
  Payout Start Date.........................................     18
  Amount of Variable Annuity Income Payments................     18
  Income Plans..............................................     19
The Fixed Account...........................................     19
  General Description.......................................     19
  Dollar Cost Averaging Fixed Account.......................     20
  Transfers, Surrenders, and Withdrawals....................     20
General Matters.............................................     20
  Owner.....................................................     20
  Beneficiary...............................................     20
  Delay of Payments.........................................     21
  Assignments...............................................     21
  Modification..............................................     21
  Customer Inquiries........................................     21
Federal Tax Matters.........................................     21
  Introduction..............................................     21
  Taxation of Annuities in General..........................     21
    Tax Deferral............................................     21
    Non-Natural Owners......................................     21
    Diversification Requirements............................     21
    Ownership Treatment.....................................     21
    Delayed Maturity Date...................................     22
    Taxation of Partial and Full Withdrawals................     22
    Taxation of Annuity Payments............................     22
    Taxation of Annuity Death Benefits......................     22
    Penalty Tax on Premature Distributions..................     22
    Aggregation of Annuity Contracts........................     22
  Tax Qualified Contracts...................................     22
    Restrictions Under Section 403(b) Plans.................     22
  Income Tax Withholding....................................     22
Voting Rights...............................................     23
Sales Commission............................................     23
Statement of Additional Information: Table of Contents......     24
Order Form..................................................     25
 
    
 
                                       2
<PAGE>
GLOSSARY
- -----------------------------------------------------------
 
    ACCUMULATION UNIT--An accounting unit used to calculate the Cash Value in
the Variable Account prior to the Payout Start Date. Each Sub-Account of the
Variable Account has its own distinct Accumulation Unit value.
 
    AGE--Age on last birthday.
 
    ANNUITANT--Includes Annuitant and any Joint Annuitant. A natural person(s)
whose life determines the duration of annuity payments involving life
contingencies.
 
    ANNUITY UNIT--An accounting unit used to calculate Variable Annuity
payments. Each Sub-Account has a distinct Annuity Unit value.
 
    AUTOMATIC ADDITIONS--Additional Purchase Payments of $25 or more which are
made automatically from the Owner's bank account or Dean Witter Active
Assets-TM- Account.
 
    BENEFICIARY--The person(s) designated in the Contract who, after the death
of any Owner or last surviving annuitant, may elect to receive the Death Benefit
or continue the Contract as described in "Benefits Under the Contract" on page
17.
 
   
    CASH VALUE--The sum of the value of all Accumulation Units for the Variable
Account plus the value in the Fixed Account (may also be known as Accumulation
Value).
    
 
    COMPANY--The issuer of the Contract, Northbrook Life Insurance Company,
which is a wholly owned subsidiary of Allstate Life Insurance Company.
 
    CONTRACT/CERTIFICATE--The Flexible Premium Deferred Variable Annuity
Contract known as the "Northbrook Variable Annuity II" that is described in this
prospectus.
 
    CONTRACT ANNIVERSARY--An anniversary of the date that the Contract was
issued to the Owner.
 
    CONTRACT YEAR--The year commencing on either the Issue Date or a Contract
Anniversary.
 
    DATE OF DEATH--The Date that an Owner and/or Annuitant dies causing a Death
Benefit to be due.
   
    DEATH BENEFIT--Prior to the Payout Start Date, the amount payable on the
death of the Owner and/or Annuitant.
    
 
    DEATH BENEFIT ANNIVERSARY--Every sixth Contract Anniversary. For example,
the 6th, 12th and 18th Contract Anniversaries are the first three Death Benefit
Anniversaries.
   
    DOLLAR COST AVERAGING FIXED ACCOUNT--A one year Guarantee Period Fixed
Account that may be used for the Dollar Cost Averaging Program.
    
   
    DOLLAR COST AVERAGING PROGRAM--A method to transfer $100 or more of the Cash
Value in the Money Market Sub-Account or the Dollar Cost Averaging Fixed Account
automatically to any Sub-Accounts on a monthly basis or other frequencies that
may be offered by the Company.
    
 
    DUE PROOF OF DEATH--One of the following:
 
        (a) A copy of a certified death certificate.
 
        (b) A copy of a certified decree of a court of competent jurisdiction as
          to the finding of death.
 
        (c) Any other proof satisfactory to the Company.
 
    EARLY WITHDRAWAL CHARGE--The charge that may be assessed by the Company on
full or partial withdrawals of the Purchase Payments in excess of the Free
Withdrawal Amount.
   
    ENHANCED DEATH BENEFIT--One of two Death Benefit options which can be
selected at the time the Contract is purchased.
    
 
    FIXED ACCOUNT--All of the assets of the Company that are not in separate
accounts. Contributions made to the Fixed Account are invested in the general
account of the Company.
 
    FIXED ANNUITY--An annuity with payments having a guaranteed amount.
 
    FREE WITHDRAWAL AMOUNT--A portion of the Cash Value which may be annually
withdrawn during the course of the Contract Year without incurring an Early
Withdrawal Charge, i.e., 15% of all Purchase Payments.
 
                                       3
<PAGE>
    FUND--The Dean Witter Variable Investment Series.
 
    GUARANTEE PERIOD--The period of time for which a credited rate on an
allocation or transfer to the Fixed Account is guaranteed.
 
    INCOME PAYMENTS--A series of periodic annuity payments made by the Company
to the Owner or Beneficiary.
 
    INVESTMENT ALTERNATIVE--The Fixed Account and the thirteen Sub-Accounts of
the Variable Account constitute the fourteen Investment Alternatives.
 
    JOINT ANNUITANT--The person, along with the Annuitant, whose life determines
the duration of annuity payments under a joint and last survivor annuity.
 
    NET INVESTMENT FACTOR--The factor for a particular Sub-Account used to
determine the value of an Accumulation Unit and Annuity Unit in any Valuation
Period.
 
    NON-QUALIFIED CONTRACTS--Contracts that do not qualify for special federal
income tax treatment.
 
    OWNER--With respect to individual Contracts, the person or person(s)
designated as the Owner(s) in the Contract. With respect to group Contracts, an
individual participant(s) under the Contract.
 
    PAYOUT START DATE--The date Income Payments are to begin under the Contract.
   
    PERFORMANCE DEATH BENEFIT--One of two Death Benefit options which can be
selected at the time the Contract is purchased.
    
 
    PORTFOLIOS--The mutual fund portfolios of The Dean Witter Variable
Investment Series. The Dean Witter Variable Investment Series has thirteen
separate Portfolios: the Money Market Portfolio, the Quality Income Plus
Portfolio, the High Yield Portfolio, the Utilities Portfolio, the Income Builder
Portfolio, the Dividend Growth Portfolio, the Capital Growth Portfolio, the
Global Dividend Growth Portfolio, the European Growth Portfolio, the Pacific
Growth Portfolio, the Capital Appreciation Portfolio, the Equity Portfolio and
the Strategist Portfolio.
 
    PURCHASE PAYMENTS--The premiums paid by the Owner to the Company.
 
    QUALIFIED CONTRACTS--Contracts issued under plans that qualify for special
federal income tax treatment.
 
    REQUIRED MINIMUM DISTRIBUTION--For Qualified Contracts, partial withdrawals
equal to the IRS Required Minimum Distribution may be taken from the Cash Value
and sent to the Owner or deposited in the Owner's bank account or Dean Witter
Active Assets-TM- Account.
 
    SETTLEMENT VALUE--The Cash Value less any applicable Early Withdrawal
Charges and premium tax. The Settlement Value will be calculated at the end of
the valuation period coinciding with a request for payment.
 
    SUB-ACCOUNT--A sub-division of the Variable Account. Each Sub-Account
invests exclusively in shares of a specified Portfolio.
 
    SYSTEMATIC WITHDRAWALS--Partial withdrawals of $100 or more may be taken
from the Cash Value and deposited in the Owner's bank account or Dean Witter
Active Assets-TM- Account or sent directly to the Owner.
 
    VALUATION DATE--Each day that the New York Stock Exchange is open for
business, except for days in which there is an insufficient degree of trading in
the Variable Account's portfolio securities that the value of Accumulation or
Annuity Units might not be materially affected by changes in the value of the
portfolio securities. The Valuation Date does not include such Federal and
non-Federal holidays as are observed by the New York Stock Exchange.
 
    VALUATION PERIOD--The period between successive Valuation Dates, commencing
on the close of business of each Valuation Date and ending at the close of
business of the next succeeding Valuation Date.
 
    VARIABLE ACCOUNT--Northbrook Variable Annuity Account II, a separate
investment account established by the Company to receive and invest the Purchase
Payments paid under the Contracts.
 
    VARIABLE ANNUITY--An annuity with payments that have no predetermined or
guaranteed dollar amounts. The payments will vary in amounts depending upon the
investment experience of one or more of the Portfolios.
 
                                       4
<PAGE>
INTRODUCTION
- -----------------------------------------------------------
 
1.  What is the purpose of the Contract?
 
The Contracts described in this Prospectus seek to allow you to accumulate funds
and to receive annuity payments ("Income Payments"), when desired, at rates
which depend upon the return achieved from the types of investments chosen.
THERE IS NO ASSURANCE THAT THIS GOAL WILL BE ACHIEVED. In attempting to achieve
this goal, the Owner can allocate Purchase Payments to one or more of the
Variable Account Portfolios. (Certain limitations may apply during the free-look
period of your Contract. See "Allocation of Purchase Payments," page 13.)
 
Because Income Payments and Cash Values invested in the Variable Account depend
on the investment experience of the selected Portfolios, the Owner bears the
entire investment risk for amounts allocated to the Variable Account. See "Value
of Variable Account Accumulation Units," page 14 and "Income Payments," page 18.
 
2.  How do I purchase a Contract?
 
You may purchase the Contract from Dean Witter, the Company's authorized sales
representative. The first Purchase Payment must be at least $4,000 (for
Qualified Contracts, $1,000). Presently, the Company will accept an initial
Purchase Payment of at least $1,000, but reserves the right to increase the
minimum initial Purchase Payment amount to $4,000. See "Purchase of the
Contracts," page 13.
 
At the time of purchase, you will allocate your Purchase Payment among the
Investment Alternatives, subject to certain limitations described in the
"Allocation of Purchase Payments" section on page 13. All allocations must be in
whole percents from 0% to 100% and must total 100%. Allocations of amounts of no
less than $100 may also be made. Allocations may be changed by notifying the
Company in writing. See "Allocation of Purchase Payments," page 13.
 
3.  What types of investments underlie the Variable Account?
 
   
The Variable Account invests exclusively in shares of the Dean Witter Variable
Investment Series (the "Fund"), a mutual fund managed by Dean Witter
InterCapital Inc., a wholly owned subsidiary of Dean Witter, Discover & Co. The
Fund has thirteen Portfolios: the Money Market Portfolio, the Quality Income
Plus Portfolio, the High Yield Portfolio, the Utilities Portfolio, the Income
Builder Portfolio, the Dividend Growth Portfolio, the Capital Growth Portfolio,
the Global Dividend Growth Portfolio, the European Growth Portfolio, the Pacific
Growth Portfolio, the Capital Appreciation Portfolio, the Equity Portfolio and
the Strategist Portfolio. The assets of each Portfolio are held separately from
the other Portfolios and each has distinct investment objectives and policies
which are described in the accompanying Prospectus for the Fund. In addition to
the Variable Account, Owners can also allocate all or part of their Purchase
Payments to the Fixed Account. See "The Fixed Account," page 19.
    
 
4.  Can I transfer amounts among the Investment Alternatives?
 
   
Transfers must be at least $100 or the entire amount in the Investment
Alternative, whichever is less. Transfers to any Guarantee Period of the Fixed
Account must be at least $500. The Dollar Cost Averaging Program automatically
moves funds on a monthly basis (or other frequencies that may be offered by the
Company) from the Money Market Sub-Account or from the Dollar Cost Averaging
Fixed Account, but not from both, to any Sub-Accounts of your choice. Transfers
into the Dollar Cost Averaging Fixed Account are not permitted. Certain
transfers may be restricted. See "Transfers," page 14.
    
 
5.  Can I get my money if I need it?
 
   
All or part of the Settlement Value can be withdrawn before the earliest of the
Payout Start Date, the death of an Owner, or the death of the last surviving
Annuitant. No Early Withdrawal Charges will be deducted on amounts up to the
annual Free Withdrawal Amount, i.e., 15% of Purchase Payments made. Amounts
withdrawn in excess of the Free Withdrawal Amount may be subject to an Early
Withdrawal Charge of 0% to 6% depending on how long the withdrawn Purchase
Payments have been invested in the Contract. THE COMPANY GUARANTEES THAT THE
AGGREGATE SURRENDER CHARGES WILL NEVER EXCEED 6% OF THE PURCHASE PAYMENTS.
Withdrawals and surrenders may be subject to income tax and a 10% tax penalty.
In addition, federal and state income tax may be withheld from withdrawal and
surrender amounts. Additional restrictions may apply to Qualified Contracts. See
"Surrender and Withdrawals," page 15, and "Taxation of Annuities in General,"
page 21.
    
 
6.  What are the charges and deductions under the Contract?
 
   
To meet its Death Benefit obligations and to pay expenses not covered by the
Contract Maintenance Charge, the Company deducts a Mortality and Expense Risk
Charge of 1.25% and an Administrative Expense Charge of .10%. For Contracts with
either one of the optional
    
 
                                       5
<PAGE>
   
Death Benefit provisions, an additional Mortality and Expense Risk Charge of
 .13% is assessed bringing the total charges for Contracts with an optional Death
Benefit provision to a Mortality and Expense Risk Charge of 1.38% and an
Administrative Expense Risk Charge of .10%. See "Mortality and Expense Risk
Charge," page 16 and "Administrative Expense Charge," page 16. Annually, the
Company deducts $30 for maintaining the Contract. See "Contract Maintenance
Charge," page 16. Additional deductions may be made for certain taxes. See
"Taxes," page 17.
    
 
7.  Does the Contract pay any guaranteed Death Benefits?
 
   
The Contracts provide that if any Owner or the last surviving Annuitant dies
prior to the Payout Start Date, a Death Benefit may be paid to the new Owner or
Beneficiary. If the Annuitant, not also an Owner dies, then the Death Benefit
may be paid to the Owner in a lump sum. If requested to be paid in a lump sum
within 180 days from the Date of Death, the Death Benefit will be the greatest
of (1) the sum of all Purchase Payments less any amounts deducted in connection
with partial withdrawals including any Early Withdrawal Charges and premium tax;
or (2) the Cash Value on the date we receive Due Proof of Death; or (3) the Cash
Value on the most recent Death Benefit Anniversary less any amounts deducted in
connection with partial withdrawals, including any Early Withdrawal Charges and
premium tax deducted from the Cash Value, since that anniversary. For Contracts
with either optional Death Benefit provision, the Death Benefit will be the
greatest of (1) through (3) above, or (4) the optional Death Benefit selected.
If an optional Death Benefit is selected, it applies only at the death of the
Owner. It does not apply to the death of the Annuitant if different from the
Owner unless the Owner is a non-natural person. See "Death Benefits Prior to the
Payout Start Date," page 17, for a full description of Death Benefit options.
    
 
Prior to the Payout Start Date the Beneficiary has 180 days from the Date of
Death of the Owner(s) or Annuitant(s) to either elect an income plan or to take
a lump sum payment. Death Benefits after the Payout Start Date, if any, will
depend on the income plan chosen. See "Benefits Under the Contract," page 17.
 
8.  Is there a free-look provision?
 
The Owner(s) may cancel the Contract anytime within 20 days after receipt of the
Contract, or longer if required by State law, and receive a full refund of
Purchase Payments allocated to the Fixed Account. Unless a refund of Purchase
Payments is required by State or Federal law, Purchase Payments allocated to the
Variable Account will be returned after an adjustment to reflect investment gain
or loss, less any applicable Contract expenses that occurred from the date of
allocation through the date of cancellation.
 
                                       6
<PAGE>
SUMMARY OF SEPARATE ACCOUNT EXPENSES
- -----------------------------------------------------------
 
   
The following fee table illustrates all expenses and fees that the Owner will
incur. The expenses and fees set forth in the table are based on charges under
the contracts and on the expenses of the separate account and the underlying
Fund for the fiscal year ended December 31, 1996.
    
 
Owner Transaction Expenses (all Sub-Accounts)
 
<TABLE>
<S>                                                                                                   <C>
Sales Load Imposed on Purchases (as a percentage of Purchase Payments)..............................       None
Early withdrawal charge (as a percentage of Purchase Payments)......................................      *
</TABLE>
 
<TABLE>
<CAPTION>
                                                                                                                APPLICABLE SALES
                                                                                                                     CHARGE
NUMBER OF COMPLETE CONTRACT YEARS SINCE PURCHASE PAYMENT BEING WITHDRAWN WAS MADE                                  PERCENTAGE
- --------------------------------------------------------------------------------------------------------------  ----------------
<S>                                                                                                             <C>
0 years.......................................................................................................         6%
1 year........................................................................................................         5%
2 years.......................................................................................................         4%
3 years.......................................................................................................         3%
4 years.......................................................................................................         2%
5 years.......................................................................................................         1%
6 years or more...............................................................................................         0%
</TABLE>
 
<TABLE>
<S>                                                                                                   <C>
Exchange Fee........................................................................................       None
Annual Contract Fee.................................................................................  $      30
</TABLE>
 
Separate Account Annual Expenses (as a percentage of average account value)
 
   
<TABLE>
<CAPTION>
                                              WITHOUT AN OPTIONAL     WITH AN OPTIONAL DEATH
                                            DEATH BENEFIT PROVISION      BENEFIT PROVISION
                                            -----------------------   -----------------------
<S>                                         <C>                       <C>
Mortality and Expense Risk Charge.........           1.25%                     1.38%
Administrative Expense Charge.............            .10%                      .10%
Total Separate Account Annual Expenses....           1.35%                     1.48%
</TABLE>
    
 
- ------------------------
 
   
*   There are no Contingent Deferred Sales Charges on amounts up to the Free
    Withdrawal Amount.
    
 
Dean Witter Variable Investment Series ("Fund") Expenses
(as a percentage of Fund average assets)
 
   
<TABLE>
<CAPTION>
                                                                    TOTAL FUND
                                          MANAGEMENT    OTHER         ANNUAL
PORTFOLIO                                    FEES      EXPENSES      EXPENSES
- ----------------------------------------  ----------   --------   --------------
<S>                                       <C>          <C>        <C>
Money Market............................    .50 %         .03%          .53%
Quality Income Plus.....................    .50 %(1)      .04%          .54%
High Yield..............................    .50 %         .04%          .54%
Utilities...............................    .65 %(2)      .03%          .68%
Income Builder..........................    .75 %(3)      .07%          .82%
Dividend Growth.........................    .59 %(4)      .02%          .61%
Capital Growth..........................    .65 %         .09%          .74%
Global Dividend Growth..................    .75 %         .13%          .88%
European Growth.........................   1.00 %         .17%         1.17%
Pacific Growth..........................   1.00 %         .44%         1.44%
Capital Appreciation....................    .75 %(3)      .07%          .82%
Equity..................................    .50 %(5)      .04%          .54%
Strategist..............................    .50 %         .02%          .52%
</TABLE>
    
 
- ------------------------
 
(1)  This percentage is applicable to Portfolio net assets of up to $500
    million. For net assets which exceed $500 million, the management fee will
    be 0.45%.
(2)  This percentage is applicable to Portfolio net assets of up to $500
    million. For net assets which exceed $500 million, the management fee will
    be 0.55%.
   
(3)  Dean Witter InterCapital Inc. has undertaken to assume all expenses for
    both the Income Builder Portfolio and the Capital Appreciation Portfolio
    until such time as the pertinent Portfolio has $50 million of net assets or
    until six months from the date of the Portfolio's commencement of
    operations, whichever occurs first.
    
(4)  The management fee will be 0.625% for net assets of up to $500 million. For
    net assets which exceed $500 million, but do not exceed $1 billion, the
    management fee will be 0.50% and for net assets that exceed $1 billion, the
    management fee will be 0.475%.
(5)  This percentage is applicable to Portfolio net assets of up to $1 billion.
    For net assets which exceed $1 billion, the management fee will be 0.475%.
 
                                       7
<PAGE>
Example
 
You (the Owner) would pay the following expenses on a $1,000 investment,
assuming a 5% annual return under the following circumstances:
 
If you surrender your Contract at the end of the applicable time period (or if
you annuitize for a specified period of less than 120 months):
   
<TABLE>
<CAPTION>
(WITH AN OPTIONAL DEATH BENEFIT PROVISION**)        1 YEAR   3 YEARS   5 YEARS   10 YEARS
                                                    ------   -------   -------   --------
<S>                                                 <C>      <C>       <C>       <C>
Money Market Sub-Account..........................    $64       $91      $121      $241
Quality Income Plus Sub-Account...................    $64       $91      $121      $242
High Yield Sub-Account............................    $64       $91      $121      $242
Utilities Sub-Account.............................    $65       $96      $129      $257
Income Builder Sub-Account........................    $67      $100      $136      $271
Dividend Growth Sub-Account.......................    $65       $93      $125      $250
Capital Growth Sub-Account........................    $66       $97      $132      $263
Global Dividend Growth Sub-Account................    $67      $102      $139      $278
European Growth Sub-Account.......................    $70      $111      $154      $307
Pacific Growth Sub-Account........................    $73      $119      $167      $333
Capital Appreciation Sub-Account..................    $67      $100      $136      $271
Equity Sub-Account................................    $64       $91      $121      $242
Strategist Sub-Account............................    $64       $91      $120      $240
 
<CAPTION>
(WITHOUT AN OPTIONAL DEATH BENEFIT PROVISION***)    1 YEAR   3 YEARS   5 YEARS   10 YEARS
                                                    ------   -------   -------   --------
<S>                                                 <C>      <C>       <C>       <C>
Money Market Sub-Account..........................    $62       $87      $114      $227
Quality Income Plus Sub-Account...................    $63       $87      $115      $228
High Yield Sub-Account............................    $63       $87      $115      $228
Utilities Sub-Account.............................    $64       $92      $122      $243
Income Builder Sub-Account........................    $65       $96      $129      $258
Dividend Growth Sub-Account.......................    $63       $89      $118      $236
Capital Growth Sub-Account........................    $65       $93      $125      $250
Global Dividend Growth Sub-Account................    $66       $98      $132      $264
European Growth Sub-Account.......................    $69      $107      $147      $294
Pacific Growth Sub-Account........................    $72      $115      $161      $321
Capital Appreciation Sub-Account..................    $65       $96      $129      $258
Equity Sub-Account................................    $63       $87      $115      $228
Strategist Sub-Account............................    $62       $87      $113      $226
</TABLE>
    
 
If you do not surrender your contract or if you annuitize* for a specified
period of 120 months or more, at the end of the applicable time period:
   
<TABLE>
<CAPTION>
(WITH AN OPTIONAL DEATH BENEFIT PROVISION**)        1 YEAR   3 YEARS   5 YEARS   10 YEARS
                                                    ------   -------   -------   --------
<S>                                                 <C>      <C>       <C>       <C>
Money Market Sub-Account..........................    $21       $66      $112      $241
Quality income Plus Sub-Account...................    $21       $66      $113      $242
High Yield Sub-Account............................    $21       $66      $113      $242
Utilities Sub-Account.............................    $23       $70      $120      $257
Income Builder Sub-Account........................    $24       $74      $127      $271
Dividend Growth Sub-Account.......................    $22       $72      $123      $263
Capital Growth Sub-Account........................    $23       $72      $123      $263
Global Dividend Growth Sub-Account................    $25       $76      $130      $278
European Growth Sub-Account.......................    $28       $85      $145      $307
Pacific Growth Sub-Account........................    $31       $93      $159      $333
Capital Appreciation Sub-Account..................    $24       $74      $127      $271
Equity Sub-Account................................    $21       $66      $113      $242
Strategist Sub-Account............................    $21       $65      $112      $240
 
<CAPTION>
(WITHOUT AN OPTIONAL DEATH BENEFIT PROVISION***)    1 YEAR   3 YEARS   5 YEARS   10 YEARS
                                                    ------   -------   -------   --------
<S>                                                 <C>      <C>       <C>       <C>
Money Market Sub-Account..........................    $20       $61      $105      $227
Quality Income Plus Sub-Account...................    $20       $62      $106      $228
High Yield Sub-Account............................    $20       $62      $106      $228
Utilities Sub-Account.............................    $21       $66      $113      $243
Income Builder Sub-Account........................    $23       $70      $121      $258
Dividend Growth Sub-Account.......................    $21       $64      $110      $236
Capital Growth Sub-Account........................    $22       $68      $116      $250
Global Dividend Growth Sub-Account................    $23       $72      $124      $264
European Growth Sub-Account.......................    $26       $81      $139      $294
Pacific Growth Sub-Account........................    $29       $89      $152      $321
Capital Appreciation Sub-Account..................    $23       $70      $121      $258
Equity Sub-Account................................    $20       $62      $106      $228
Strategist Sub-Account............................    $20       $61      $105      $226
</TABLE>
    
 
The above example should not be considered a representation of past or future
expense. Actual expenses may be greater or lesser than those shown. The purpose
of the example is to assist you in understanding the various costs and expenses
that you will bear directly or indirectly. Premium taxes are not reflected in
the example but may be applicable.
 
- --------------------------
  *Early Withdrawal Charges may be deducted from the Cash Value before it is
   applied to an income plan with a specified period of less than 120 months.
 
 **Total Separate Account Annual Expenses of 1.48%
 
***Total Separate Account Annual Expenses of 1.35%
 
                                       8
<PAGE>
CONDENSED FINANCIAL INFORMATION
- -----------------------------------------------------------
 
                      Accumulation Unit Values and Number
                     of Accumulation Units Outstanding for
                       Each Sub-Account since Inception*
 
<TABLE>
<CAPTION>
                                                                              FOR THE YEARS
                                                                         BEGINNING JANUARY 1 AND
                                                                           ENDING DECEMBER 31
                                                    -----------------------------------------------------------------
                                                     1990      1991       1992        1993        1994        1995
                                                    -------  ---------  ---------  ----------  ----------  ----------
<S>                                                 <C>      <C>        <C>        <C>         <C>         <C>
MONEY MARKET SUB-ACCOUNT
  Accumulation Unit Value, Beginning of Period....  $10.000    $10.111    $10.549     $10.765     $10.913     $11.178
  Accumulation Unit Value, End of Period..........  $10.111    $10.549    $10.765     $10.913     $11.178     $11.653
  Number of Units Outstanding, End of Period......  345,667  1,864,548  3,481,984   7,643,579  19,047,342  17,483,665
QUALITY INCOME PLUS SUB-ACCOUNT
  Accumulation Unit Value, Beginning of Period....  $10.000    $10.403    $12.163     $12.993     $14.487     $13.344
  Accumulation Unit Value, End of Period..........  $10.403    $12.163    $12.993     $14.487     $13.344     $16.373
  Number of Units Outstanding, End of Period......  175,839  1,221,348  6,701,534  26,314,453  25,348,646  26,735,500
HIGH YIELD SUB-ACCOUNT
  Accumulation Unit Value, Beginning of Period....  $10.000     $8.932    $13.982     $16.336     $20.022     $19.264
  Accumulation Unit Value, End of Period..........   $8.932    $13.982    $16.336     $20.022     $19.264     $21.859
  Number of Units Outstanding, End of Period......    1,574     64,097    377,434   2,451,231   4,082,485   5,536,230
UTILITIES SUB-ACCOUNT
  Accumulation Unit Value, Beginning of Period....  $10.000    $10.471    $12.454     $13.840     $15.798     $14.180
  Accumulation Unit Value, End of Period..........  $10.471    $12.454    $13.840     $15.798     $14.180     $17.999
  Number of Units Outstanding, End of Period......  130,114  1,615,460  6,626,508  25,354,331  22,552,568  22,626,178
INCOME BUILDER SUB-ACCOUNT
  Accumulation Unit Value, Beginning of Period....    --        --         --          --          --          --
  Accumulation Unit Value, End of Period..........    --        --         --          --          --          --
  Number of Units Outstanding, End of Period......    --        --         --          --          --          --
DIVIDEND GROWTH SUB-ACCOUNT
  Accumulation Unit Value, Beginning of Period....  $10.000    $11.037    $13.911     $14.844     $16.746     $15.981
  Accumulation Unit Value, End of Period..........  $11.037    $13.911    $14.844     $16.746     $15.981     $21.505
  Number of Units Outstanding, End of Period......  159,555  2,004,718  7,123,073  21,941,369  28,980,558  33,515,201
CAPITAL GROWTH SUB-ACCOUNT
  Accumulation Unit Value, Beginning of Period....    --       $10.000    $12.697     $12.731     $11.682     $11.379
  Accumulation Unit Value, End of Period..........    --       $12.697    $12.731     $11.682     $11.379     $14.923
  Number of Units Outstanding, End of Period......    --       901,617  2,655,336   3,556,779   3,411,788   3,917,752
GLOBAL DIVIDEND GROWTH SUB-ACCOUNT
  Accumulation Unit Value, Beginning of Period....    --        --         --          --         $10.000      $9.912
  Accumulation Unit Value, End of Period..........    --        --         --          --          $9.912     $11.935
  Number of Units Outstanding, End of Period......    --        --         --          --      12,306,690  15,325,898
EUROPEAN GROWTH SUB-ACCOUNT
  Accumulation Unit Value, Beginning of Period....    --       $10.000    $10.020     $10.280     $14.290     $15.278
  Accumulation Unit Value, End of Period..........    --       $10.020    $10.280     $14.290     $15.278     $18.976
  Number of Units Outstanding, End of Period......    --       248,922    719,495   4,448,126   8,491,681   8,587,679
PACIFIC GROWTH SUB-ACCOUNT
  Accumulation Unit Value, Beginning of Period....    --        --         --          --         $10.000      $9.221
  Accumulation Unit Value, End of Period..........    --        --         --          --          $9.221      $9.619
  Number of Units Outstanding, End of Period......    --        --         --          --       7,080,863   8,865,898
CAPITAL APPRECIATION SUB-ACCOUNT
  Accumulation Unit Value, Beginning of Period....    --        --         --          --          --          --
  Accumulation Unit Value, End of Period..........    --        --         --          --          --          --
  Number of Units Outstanding, End of Period......    --        --         --          --          --          --
EQUITY SUB-ACCOUNT
  Accumulation Unit Value, Beginning of Period....  $10.000    $10.706    $16.799     $16.599     $19.604     $18.392
  Accumulation Unit Value, End of Period..........  $10.706    $16.799    $16.599     $19.604     $18.392     $25.864
  Number of Units Outstanding, End of Period......   15,701    369,133  1,417,732   5,917,819   8,914,107  10,835,413
STRATEGIST SUB-ACCOUNT
  Accumulation Unit Value, Beginning of Period....  $10.000    $10.483    $13.266     $14.035     $15.286     $15.675
  Accumulation Unit Value, End of Period..........  $10.483    $13.266    $14.035     $15.286     $15.675     $16.919
  Number of Units Outstanding, End of Period......    5,854    778,440  3,385,842  11,837,077  18,218,900  17,717,645
</TABLE>
 
- --------------------------
   
 * The Money Market, Quality Income Plus, High Yield, Utilities, Dividend
   Growth, Equity and Strategist Sub-Accounts commenced operations on October
   25, 1990. The Capital Growth and European Growth Sub-Accounts commenced
   operations on March 1, 1991. The Global Dividend Growth and Pacific Growth
   Sub-Accounts commenced operations on February 23, 1994. The Income Builder
   and the Capital Appreciation Sub-Accounts commenced operations on January 21,
   1997. The Accumulation Unit Value for each of these Sub-Accounts was
   initially set at $10.000. The Accumulation Unit Values in this table reflect
   a Mortality and Expense Risk Charge of 1.25% and an Administrative Expense
   charge of .10%.
    
 
                                       9
<PAGE>
   
                      Accumulation Unit Values and Number
                     of Accumulation Units Outstanding for
                        Each Sub-Account since Inception
            for Contracts with an Optional Death Benefit Provision*
    
 
<TABLE>
<CAPTION>
                                                                         1995
                                                                        -------
<S>                                                                     <C>
MONEY MARKET SUB-ACCOUNT
  Accumulation Unit Value, Beginning of Period........................  $11.579
  Accumulation Unit Value, End of Period..............................  $11.651
  Number of Units Outstanding, End of Period..........................  511,096
QUALITY INCOME PLUS SUB-ACCOUNT
  Accumulation Unit Value, Beginning of Period........................  $15.746
  Accumulation Unit Value, End of Period..............................  $16.370
  Number of Units Outstanding, End of Period..........................  142,004
HIGH YIELD SUB-ACCOUNT
  Accumulation Unit Value, Beginning of Period........................  $21.462
  Accumulation Unit Value, End of Period..............................  $21.855
  Number of Units Outstanding, End of Period..........................   66,987
UTILITIES SUB-ACCOUNT
  Accumulation Unit Value, Beginning of Period........................  $16.972
  Accumulation Unit Value, End of Period..............................  $17.995
  Number of Units Outstanding, End of Period..........................  165,046
INCOME BUILDER SUB-ACCOUNT
  Accumulation Unit Value, Beginning of Period........................    --
  Accumulation Unit Value, End of Period..............................    --
  Number of Units Outstanding, End of Period..........................    --
DIVIDEND GROWTH SUB-ACCOUNT
  Accumulation Unit Value, Beginning of Period........................  $20.068
  Accumulation Unit Value, End of Period..............................  $21.500
  Number of Units Outstanding, End of Period..........................  366,928
CAPITAL GROWTH SUB-ACCOUNT
  Accumulation Unit Value, Beginning of Period........................  $13.895
  Accumulation Unit Value, End of Period..............................  $14.920
  Number of Units Outstanding, End of Period..........................   36,005
GLOBAL DIVIDEND SUB-ACCOUNT
  Accumulation Unit Value, Beginning of Period........................  $11.250
  Accumulation Unit Value, End of Period..............................  $11.932
  Number of Units Outstanding, End of Period..........................  155,023
EUROPEAN GROWTH SUB-ACCOUNT
  Accumulation Unit Value, Beginning of Period........................  $18.486
  Accumulation Unit Value, End of Period..............................  $18.972
  Number of Units Outstanding, End of Period..........................   62,011
PACIFIC GROWTH SUB-ACCOUNT
  Accumulation Unit Value, Beginning of Period........................  $ 9.352
  Accumulation Unit Value, End of Period..............................  $ 9.617
  Number of Units Outstanding, End of Period..........................   97,952
CAPITAL APPRECIATION SUB-ACCOUNT
  Accumulation Unit Value, Beginning of Period........................    --
  Accumulation Unit Value, End of Period..............................    --
  Number of Units Outstanding, End of Period..........................    --
EQUITY SUB-ACCOUNT
  Accumulation Unit Value, Beginning of Period........................  $24.677
  Accumulation Unit Value, End of Period..............................  $25.858
  Number of Units Outstanding, End of Period..........................  215,961
STRATEGIST SUB-ACCOUNT
  Accumulation Unit Value, Beginning of Period........................  $16.490
  Accumulation Unit Value, End of Period..............................  $16.915
  Number of Units Outstanding, End of Period..........................   91,983
</TABLE>
 
- --------------------------
   
 * All of the above Sub-Accounts commenced operations on October 30, 1995,
   except the Income Builder Sub-Account and the Capital Appreciation
   Sub-Account commenced operations on January 21, 1997. The Accumulation Unit
   Value for each of these Sub-Accounts was initially set at $10.000. The
   Accumulation Unit Values in this table reflect a Mortality and Expense Risk
   Charge of 1.38% and an Administrative Expense Charge of .10%. The additional
   .13% Mortality and Expense Risk Charge is applicable to Contract Owners who
   selected an optional Death Benefit provision.
    
 
                                       10
<PAGE>
PERFORMANCE DATA
- -----------------------------------------------------------
 
From time to time the Variable Account may publish advertisements containing
performance data relating to its Sub-Accounts. The performance data for the
Sub-Accounts (other than for the Money Market Sub-Account) will always be
accompanied by total return quotations for the most recent one, five and ten
year periods, or for a period from inception to date if the Sub-Account has not
been available for one of the prescribed periods. The total return quotations
for each period will be the average annual rates of return required for an
initial Purchase Payment of $1,000 to equal the amount Owners would receive on a
withdrawal of the Purchase Payment, after reflection of all recurring and
nonrecurring charges.
 
In addition, the Variable Account may advertise the total return over different
periods of time by means of aggregate, average, year-by-year or other types of
total return figures. Such calculations may or may not reflect the deduction of
some or all of the charges which may be imposed on the Contracts by the Variable
Account which, if reflected, would reduce the performance quoted. The Variable
Account from time to time may also advertise the performance of the Sub-Accounts
relative to certain performance rankings and indexes compiled by independent
organizations.
 
Performance figures used by the Variable Account are based on actual historical
performance of its Sub-Accounts for specified periods, and the figures are not
intended to indicate future performance. More detailed information on the
computation is set forth in the Statement of Additional Information.
 
FINANCIAL STATEMENTS
- -----------------------------------------------------------
 
The financial statements of the Northbrook Variable Annuity Account II and
Northbrook Life Insurance Company may be found in the Statement of Additional
Information, which is incorporated by reference into this Prospectus and which
is available upon request. (See Order Form on page 25.)
 
NORTHBROOK LIFE INSURANCE COMPANY AND THE VARIABLE ACCOUNT
- -----------------------------------------------------------
 
NORTHBROOK LIFE INSURANCE COMPANY
The Company is the issuer of the Contract. Incorporated in 1978 as a stock life
insurance company under the laws of Illinois, the Company sells annuities and
individual life insurance. The Company is currently licensed to operate in the
District of Columbia, all states (except New York) and Puerto Rico. The
Company's home office is located at 3100 Sanders Road, Northbrook, Illinois,
60062.
 
The Company is a wholly owned subsidiary of Allstate Life
   
Insurance Company ("Allstate Life"), which is a stock life insurance company
incorporated under the laws of Illinois. Allstate Life is a wholly owned
subsidiary of Allstate Insurance Company ("Allstate"), which is a stock
property-liability insurance company incorporated under the laws of Illinois.
All of the outstanding capital stock of Allstate is owned by The Allstate
Corporation ("Corporation"). On June 30, 1995, Sears, Roebuck and Co. ("Sears")
distributed its 80.3% ownership in the Corporation to Sears common shareholders
through a tax-free dividend.
    
 
DEAN WITTER REYNOLDS INC.
 
Dean Witter Reynolds Inc. ("Dean Witter") is the principal underwriter of the
Contract. Dean Witter is a wholly owned subsidiary of Dean Witter, Discover &
Co. ("Dean Witter Discover"). Dean Witter is located at Two World Trade Center,
New York, New York, 10048. Dean Witter is a member of the New York Stock
Exchange and the National Association of Securities Dealers, Inc.
 
Dean Witter Discover's wholly owned subsidiary, Dean Witter InterCapital Inc.
("InterCapital"), is the investment manager of the Dean Witter Variable
Investment Series. InterCapital is registered with the Securities and Exchange
Commission as an investment adviser. As compensation for investment management,
the Fund pays InterCapital a monthly advisory fee. These expenses are more fully
described in the Fund's Prospectus attached to this Prospectus.
 
   
On February 5, 1997, Dean Witter Discover and Morgan Stanley Group Inc.
announced that they had entered into an Agreement and Plan of Merger, with the
combined company to be named Morgan Stanley, Dean Witter, Discover & Co. The
business of
    
 
                                       11
<PAGE>
   
Morgan Stanley Group Inc. and its affiliated companies is providing a wide range
of financial services for sovereign governments, corporations, institutions and
individuals throughout the world. Dean Witter Discover is the direct parent of
InterCapital and Dean Witter Distributors Inc., the Fund's distributor. It is
currently anticipated that the transaction will close in mid-1997. Thereafter,
InterCapital and Dean Witter Distributors Inc. will be direct subsidiaries of
Morgan Stanley, Dean Witter, Discover & Co.
    
 
In October, 1993, Allstate, through Allstate Life and the Company, announced a
strategic alliance to develop, market and distribute proprietary annuity and
life insurance products through Dean Witter account executives.
 
THE VARIABLE ACCOUNT
 
Established on May 18, 1990, the Variable Account is a unit investment trust
registered with the Securities and Exchange Commission under the Investment
Company Act of 1940, but such registration does not signify that the Commission
supervises the management or investment practices or policies of the Variable
Account. The investment performance of the Variable Account is entirely
independent of both the investment performance of the Company's general account
and the performance of any other separate account.
 
The assets of the Variable Account are held separately from the other assets of
the Company. They are not chargeable with liabilities incurred in the Company's
other business operations. Accordingly, the income, capital gains and capital
losses, realized or unrealized, incurred on the assets of the Variable Account
are credited to or charged against the assets of the Variable Account, without
regard to the income, capital gains or capital losses arising out of any other
business the Company may conduct.
 
The Variable Account has been divided into thirteen Sub-Accounts, each of which
invests solely in its corresponding Portfolio of the Dean Witter Variable
Investment Series. Additional Sub-Accounts may be added at the discretion of the
Company.
 
DEAN WITTER VARIABLE INVESTMENT SERIES
 
The Variable Account will invest exclusively in the Dean Witter Variable
Investment Series (the "Fund"). Shares of the Fund are also offered to separate
accounts of the Company which fund other variable annuity and variable life
contracts. Shares of the Fund are also offered to separate accounts of a life
insurance company affiliated with the Company which fund variable annuity and
variable life contracts. Shares of the Fund are also offered to separate
accounts of certain non-affiliated life insurance companies which fund variable
life insurance contracts. It is conceivable that in the future it may become
disadvantageous for both variable life and variable annuity contract separate
accounts to invest in the same underlying Fund. Although neither the Company nor
the Fund currently foresees any such disadvantage, the Fund's Board of Trustees
intends to monitor events in order to identify any material irreconcilable
conflict between the interests of variable annuity contract owners and variable
life contract owners and to determine what action, if any, should be taken in
response thereto.
 
Investors in the High Yield Portfolio should carefully consider the relative
risks of investing in high yield securities, which are commonly known as junk
bonds. Bonds of this type are considered to be speculative with regard to the
payment of interest and return of principal. Investors in the High Yield
Portfolio should also be cognizant of the fact that such securities are not
generally meant for short-term investing and should assess the risks associated
with an investment in the High Yield Portfolio.
 
Shares of the Portfolios of the Fund are not deposits, or obligations of, or
guaranteed or endorsed by any bank and the shares are not federally insured by
the Federal Deposit Insurance Corporation, the Federal Reserve Board or any
other agency.
 
   
The Fund has thirteen portfolios: the Money Market Portfolio, the Quality Income
Plus Portfolio, the High Yield Portfolio, the Utilities Portfolio, the Income
Builder Portfolio, the Dividend Growth Portfolio, the Capital Growth Portfolio,
the Global Dividend Growth Portfolio, the European Growth Portfolio, the Pacific
Growth Portfolio, the Capital Appreciation Portfolio, the Equity Portfolio and
the Strategist Portfolio. Each Portfolio has different investment objectives and
policies and operates as a separate investment fund.
    
 
The Money Market Portfolio seeks high current income, preservation of capital,
and liquidity by investing in certain money market instruments, principally U.S.
government securities, bank obligations, and high grade commercial paper.
 
The Quality Income Plus Portfolio seeks, as its primary objective, to earn a
high level of current income and, as a secondary objective, capital
appreciation, but only when consistent with its primary objective, by investing
primarily in debt securities issued by the U.S. Government, its agencies and
instrumentalities, including zero coupon securities and in fixed-income
securities rated A or higher by Moody's Investors Service, Inc. ("Moody's") or
Standard & Poor's Corporation ("Standard & Poor's") or non-rated securities of
comparable quality, and by writing covered call and put options against such
securities.
 
The High Yield Portfolio seeks, as its primary objective, to earn a high level
of current income by investing in a professionally managed diversified portfolio
consisting principally of fixed-income securities rated Baa or lower by Moody's
or BBB or lower by Standard & Poor's or non-rated securities of comparable
quality, which are commonly known as junk bonds, and, as a secondary objective,
capital appreciation when consistent with its primary objective.
 
The Utilities Portfolio seeks to provide current income and long-term growth of
income and capital by investing primarily in equity and fixed-income securities
of companies engaged in the public utilities industry.
 
The Income Builder Portfolio seeks, as its primary objective, reasonable income
by investing primarily in common stock of large-cap companies which have a
record of paying dividends and the potential for maintaining dividends, in
preferred stock and in securities convertible into common stocks of small and
mid-cap companies and, as its secondary objective, growth of capital.
 
                                       12
<PAGE>
The Dividend Growth Portfolio seeks to provide reasonable current income and
long-term growth of income and capital by investing primarily in common stock of
companies with a record of paying dividends and the potential for increasing
dividends.
 
The Capital Growth Portfolio seeks to provide long-term capital growth by
investing principally in common stocks.
 
The Global Dividend Growth Portfolio seeks to provide reasonable current income
and long-term growth of income and capital by investing primarily in common
stock of companies, issued by issuers worldwide, with a record of paying
dividends and the potential for increasing dividends.
 
The European Growth Portfolio seeks to maximize the capital appreciation on its
investments by investing primarily in securities issued by issuers located in
Europe.
 
The Pacific Growth Portfolio seeks to maximize the capital appreciation of its
investments by investing primarily in securities issued by issuers located in
Asia, Australia and New Zealand.
 
The Capital Appreciation Portfolio seeks long-term capital appreciation by
investing primarily in common stocks of U.S. companies that offer the potential
for either superior earnings growth and/or appear to be undervalued.
 
The Equity Portfolio seeks, as its primary objective, growth of capital through
investments in common stock of companies believed by the Investment Manager to
have potential for superior growth and, as a secondary objective, income when
consistent with its primary objective.
 
The Strategist Portfolio seeks a high total investment return through a fully
managed investment policy utilizing equity securities, fixed-income securities
rated Baa or higher by Moody's or BBB or higher by Standard & Poor's (or
non-rated securities of comparable quality), and money market securities, and
the writing of covered options on such securities and the collateralized sale of
stock index options.
 
All dividends and capital gains distributions from the Portfolios are
automatically reinvested in shares of the distributing Portfolio at their net
asset value.
 
THERE IS NO ASSURANCE THAT ANY OF THE PORTFOLIOS WILL ATTAIN THEIR RESPECTIVE
STATED OBJECTIVES. Additional information concerning the investment objectives
and policies of the Portfolios can be found in the current prospectus for the
Fund accompanying this Prospectus.
 
THE PROSPECTUS OF THE FUND SHOULD BE READ CAREFULLY BEFORE ANY DECISION IS MADE
CONCERNING THE ALLOCATION OF PURCHASE PAYMENTS TO A PARTICULAR PORTFOLIO.
 
THE CONTRACTS
- -----------------------------------------------------------
 
PURCHASE OF THE CONTRACTS
 
The Contracts may be purchased through sales representatives of Dean Witter. The
first Purchase Payment must be at least $4,000 unless the Contract is a
Qualified Contract, in which case the first Purchase Payment must be at least
$1,000. Presently, the Company will accept an initial Purchase Payment of at
least $1,000, but reserves the right to increase the minimum initial Purchase
Payment amount to $4,000. All subsequent Purchase Payments must be $25 or more
and may be made at any time prior to the Payout Start Date. Additional Purchase
Payments may also be made from your bank account or your Dean Witter Active
Assets-TM- Account through Automatic Additions. Please consult with your Dean
Witter Account Executive for detailed information about Automatic Additions.
 
The Company reserves the right to limit the amount of Purchase Payments it will
accept.
 
CREDITING OF INITIAL PURCHASE PAYMENTS
 
A Purchase Payment accompanied by completed information will be credited to the
Contract within two business days of receipt by the Company at its home office.
If the information is not complete, the Company will credit the Purchase
Payments to the Contract within five business days or return it at that time
unless the applicant specifically consents to the Company holding the Purchase
Payment until the information is complete. The Company reserves the right to
reject any proposed purchase of the Contract. Subsequent Purchase Payments will
be credited to the Contract at the close of the Valuation Period in which the
Purchase Payment is received.
 
ALLOCATION OF PURCHASE PAYMENTS
 
At the time of purchase the Owner instructs the Company how to allocate the
Purchase Payment among the fourteen Investment Alternatives. Purchase Payments
may be allocated in whole percents, from 0% to 100%, to any Investment
Alternative so long as the total allocation equals 100%. Purchase Payments may
be allocated in amounts of no less than $100. Unless the Owner notifies the
Company otherwise, subsequent Purchase Payments are allocated according to the
original instructions.
 
In those states where the Company is required to return the Purchase Payment
upon a free-look of the Contract and where it has been approved by the state,
the Company reserves the right to allocate all Purchase Payments made prior to
the expiration of the free-look provision to the Money Market Sub-Account of the
Variable Account. Thereafter, Purchase Payments may be made at any time during
the accumulation phase into any of the Investment Alternatives. After the
expiration of the free-look provision
 
                                       13
<PAGE>
the Owner may instruct the Company how to allocate the Purchase Payment(s) among
the fourteen Investment Alternatives. Purchase Payments may be allocated in
whole percents, from 0% to 100%, to any Investment Alternative so long as the
total allocation equals 100%. Purchase Payments may be allocated in amounts of
no less than $100. If, after the free-look period, the Owner does not
affirmatively request a transfer to other Sub-Accounts, the Purchase Payments
will remain in the Money Market Sub-Account indefinitely. Please consult with
your Account Executive for applicability of this provision.
Each Purchase Payment will be credited to the Contract as Variable Account
Accumulation Units equal to the amount of the Purchase Payment allocated to each
Sub-Account divided by the Accumulation Unit value for that Sub-Account next
computed after the Purchase Payment is credited to the Contract. For example, if
a $10,000 Purchase Payment is credited to the Contract when the Accumulation
Unit value equals $10, then 1,000 Accumulation Units would be credited to the
Contract. The Variable Account, in turn, purchases shares of the corresponding
Portfolio (see "Value of Variable Account Accumulation Units," page 14).
 
For a brief summary of how Purchase Payments allocated to the Fixed Account are
credited to the Contract, see "The Fixed Account" on page 19.
 
VALUE OF VARIABLE ACCOUNT ACCUMULATION UNITS
 
The Accumulation Units in each Sub-Account of the Variable Account are valued
separately. The value of Accumulation Units may change each Valuation Period
according to the investment performance of the shares purchased by each
Sub-Account and the deduction of certain expenses and charges.
 
A Valuation Period is the period between successive Valuation Dates. It begins
at the close of business of each Valuation Date and ends at the close of
business of the next succeeding Valuation Date. A Valuation Date is each day
that the New York Stock Exchange is open for business except for any day in
which there is an insufficient degree of trading in the Variable Account's
portfolio securities that the value of Accumulation or Annuity Units might not
be materially affected by changes in the value of the portfolio securities.
Valuation Dates do not include such Federal and non-Federal holidays as are
observed by the New York Stock Exchange. The New York Stock Exchange currently
observes the following holidays: New Year's Day (January 1); President's Day
(the third Monday in February); Good Friday (the Friday before Easter); Memorial
Day (the last Monday in May); Independence Day (July 4); Labor Day (the first
Monday in September); Thanksgiving Day (the fourth Thursday in November); and
Christmas Day (December 25).
The value of an Accumulation Unit in a Sub-Account for any Valuation Period
equals the value of the Accumulation Unit as of the immediately preceding
Valuation Period, multiplied by the Net Investment Factor for that Sub-Account
for the current Valuation Period. The Net Investment Factor is a number
representing the change on successive Valuation Dates in value of Sub-Account
assets due to investment income, realized or unrealized capital gains or loss,
deductions for taxes, if any, and deductions for the Mortality and Expense Risk
Charge and Administrative Expense Charge.
 
TRANSFERS
 
   
Transfers must be at least $100 or the total amount in the Investment
Alternative whichever is less. Transfers to any Guarantee Period of the Fixed
Account must be at least $500. Transfers into the Dollar Cost Averaging Fixed
Account are not permitted. Currently there is no charge for transfers among the
fourteen Investment Alternatives. The Company, however, reserves the right to
assess a $25 charge on all transfers in excess of twelve per Contract Year. If
you are required to allocate Purchase Payments to the Money Market Sub-Account
of the Variable Account during the free-look period of your Contract, the first
transfer made following the end of the free-look period will not be counted as a
transfer for purposes of assessing this charge. The Company will notify Owners
at least 30 days prior to imposing the transfer charge.
    
 
If, under the terms of the free-look provision, your Purchase Payments have been
allocated to the Money Market Sub-Account of the Variable Account, you may not
transfer amounts out of the Money Market Sub-Account, until the free-look
provision has expired. After the free-look provision has expired and prior to
the payout start date, you may make transfers among all Investment Alternatives.
 
Transfers out of any Sub-Account before the Payout Start Date may be made at any
time.
 
After the Payout Start Date, transfers among Sub-Accounts of the Variable
Account, or from the Variable Account to the Fixed Account may be made only once
every six months and may not be made during the first six months following the
Payout Start Date.
 
Transfers may be made pursuant to telephone instructions if the Owner authorizes
telephone transfers at the time of purchase, or subsequently on a form provided
by the Company. Telephone transfer requests will be accepted by the Company if
received at 800/654-2397 by 3:00 p.m. Central Time. Telephone transfer requests
received at any other telephone number or after 3:00 p.m. Central Time will not
be accepted by the Company. Telephone transfer requests received before 3:00
p.m. Central Time are effected at the next computed value. Otherwise, transfer
requests must be in writing, on a form provided by the Company.
 
   
Transfers may also be made automatically through the Dollar Cost Averaging
Program prior to the Payout Start Date. The Dollar Cost Averaging Program
permits the Owner to transfer a specified amount every month (or other
frequencies that may be offered by the Company) from the Money Market
Sub-Account or from the Dollar Cost Averaging Fixed Account, but not from both,
to any Sub-Account. Transfers made through Dollar Cost Averaging must be $100 or
more. The Dollar Cost Averaging Program cannot be used to transfer amounts to
the Fixed Account. Please consult with your Dean Witter Account Executive for
detailed information about the Dollar Cost Averaging Program.
    
 
Transfers from Sub-Accounts of the Variable Account will be made based on the
Accumulation Unit values next computed after the Company receives the transfer
request at its home office.
 
For transfers involving the Fixed Account, see page 20.
 
                                       14
<PAGE>
SURRENDER AND WITHDRAWALS
 
The Owner may withdraw all or part of the Cash Value at anytime prior to the
earlier of the death of the last surviving Annuitant, death of any Owner or the
Payout Start Date. The amount available for withdrawal is the Cash Value next
computed after the Company receives the request for a withdrawal at its home
office, less any Early Withdrawal Charges, Contract Maintenance Charges or any
remaining charge for premium taxes. Withdrawals from the Variable Account will
be paid within seven days of receipt of the request, subject to postponement in
certain circumstances. See "Delay of Payments," page 21. For withdrawals from
the Fixed Account, see page 20.
 
The minimum partial withdrawal is $100. If the Cash Value after a partial
withdrawal would be less than $500, then the Company will treat the request as
one for a total surrender of the Contract and the entire Cash Value, less any
charges and premium taxes, will be paid out.
 
Partial withdrawals may also be taken automatically through monthly Systematic
Withdrawals. Systematic Withdrawals of $100 or more may be requested at any time
prior to the Payout Start Date. Please consult with your Dean Witter Account
Executive for detailed information about Systematic Withdrawals.
 
For Qualified Contracts, the Company will at the request of the Owner,
automatically calculate and withdraw the IRS Required Minimum Distribution.
Withdrawals taken to satisfy IRS required minimum distribution rules will have
any applicable withdrawal charges waived. This waiver is permitted only for
withdrawals which satisfy distributions resulting from this Contract. Please
consult with your Dean Witter Account Executive for detailed information about
the Required Minimum Distribution program.
 
Withdrawals and surrenders may be subject to income tax and a 10% tax penalty.
This tax and penalty is explained in "Federal Tax Matters" on page 21.
 
The full Contract Maintenance Charge will be deducted at the time of total
surrender. The total amount paid at surrender may be more or less than the total
Purchase Payments due to prior withdrawals, any deductions, and investment
performance.
 
To complete the partial withdrawals, the Company will cancel Accumulation Units
in an amount equal to the withdrawal and any applicable Early Withdrawal Charge
and premium taxes. The Owner must name the Investment Alternative from which the
withdrawal is to be made. If none is named, then the withdrawal request is
incomplete and cannot be honored.
 
DEFAULT
 
So long as the Cash Value is not reduced to zero or a withdrawal does not reduce
it to less than $500, the Contract will stay in force until the Payout Start
Date even if no Purchase Payments are made after the first Purchase Payment.
 
CHARGES AND OTHER DEDUCTIONS
- -----------------------------------------------------------
 
DEDUCTIONS FROM PURCHASE PAYMENTS
 
No deductions are currently made from Purchase Payments. Therefore the full
amount of every Purchase Payment is invested in the Investment Alternative(s) to
increase the potential for investment gain.
 
EARLY WITHDRAWAL CHARGE (CONTINGENT DEFERRED SALES CHARGE)
 
The Owner may withdraw the Cash Value at any time before the earliest of the
Payout Start Date, the death of any Owner or the last surviving Annuitant's
death.
 
There are no Early Withdrawal Charges on amounts up to the Free Withdrawal
Amount. A Free Withdrawal Amount will be available in each Contract Year. The
Free Withdrawal Amount may not be available in the first Contract Year if not
approved in your state of residence. The annual Free Withdrawal Amount is 15% of
the amount of Purchase Payments. Amounts withdrawn in excess of the Free
Withdrawal Amount may be subject to an Early Withdrawal Charge. Free Withdrawal
Amounts not withdrawn in a Contract Year do not increase the Free Withdrawal
Amount in later Contract Years. Early Withdrawal Charges, if applicable, will be
deducted from the amount paid.
 
In certain cases, distributions required by federal tax law (see the Statement
of Additional Information for "IRS Required Distribution at Death Rules") may be
subject to an Early Withdrawal Charge. Early Withdrawal Charges may be deducted
from the Cash Value before it is applied to an income plan with a specified
period of less than 120 months.
 
Free Withdrawals and other partial withdrawals will be allocated on a first in,
first out basis to Purchase Payments. For purposes of calculating the amount of
the Early Withdrawal Charge, withdrawals are assumed to come from Purchase
Payments first, beginning with the oldest payment. Unless the Company is
instructed otherwise, for partial withdrawals, the Early Withdrawal Charge will
be deducted from the amount paid, rather than from the remaining Cash Value.
Once all Purchase Payments have been withdrawn, additional withdrawals will not
be assessed an Early Withdrawal Charge.
 
                                       15
<PAGE>
Early Withdrawal Charges will be applied to amounts withdrawn in excess of a
Free Withdrawal Amount as set forth below:
 
<TABLE>
<CAPTION>
                                                                      APPLICABLE
                   COMPLETE CONTRACT YEARS SINCE                      WITHDRAWAL
                       PURCHASE PAYMENT BEING                           CHARGE
                         WITHDRAWN WAS MADE                           PERCENTAGE
- --------------------------------------------------------------------  ----------
<S>                                                                   <C>
0 years.............................................................      6%
1 year..............................................................      5%
2 years.............................................................      4%
3 years.............................................................      3%
4 years.............................................................      2%
5 years.............................................................      1%
6 years or more.....................................................      0%
</TABLE>
 
THE CUMULATIVE TOTAL OF ALL EARLY WITHDRAWAL CHARGES IS GUARANTEED NEVER TO
EXCEED 6% OF AN OWNER'S PURCHASE PAYMENTS.
 
Early Withdrawal Charges will be used to pay sales commissions and other
promotional or distribution expenses associated with the marketing of the
Contracts. The Company does not anticipate that the Early Withdrawal Charges
will cover all distribution expenses in connection with the Contract.
 
In addition, federal and state income tax may be withheld from withdrawal and
surrender amounts. Certain surrenders may also be subject to a federal tax
penalty. See "Federal Tax Matters," page 21.
 
CONTRACT MAINTENANCE CHARGE
A Contract Maintenance Charge is deducted annually from the Cash Value to
reimburse the Company for its actual costs in maintaining each Contract and the
Variable Account. THE COMPANY GUARANTEES THAT THE AMOUNT OF THIS CHARGE WILL NOT
EXCEED $30 PER CONTRACT YEAR OVER THE LIFE OF THE CONTRACT. Maintenance costs
include but are not limited to expenses incurred in billing and collecting
Purchase Payments; keeping records; processing death claims and cash surrenders;
policy changes and proxy statements; calculating Accumulation Unit and Annuity
Unit values; and issuing reports to Owners and regulatory agencies. The Company
does not expect to realize a profit from this charge.
 
On each Contract Anniversary, the Contract Maintenance Charge will be deducted
from the Investment Alternatives in the same proportion that the Owner's
interest in each bears to the total Cash Value. After the Payout Start Date, a
pro rata share of the annual Contract Maintenance Charge will be deducted from
each Income Payment. For example, 1/12 of the $30 or $2.50 will be deducted if
there are twelve Income Payments during the Contract Year. The Contract
Maintenance Charge will be deducted from the amount paid on a total surrender.
 
Prior to October 4, 1993 Vantage Computer Systems, Inc. was under contract with
the Company to provide contract recordkeeping services. As of October 4, 1993,
the Company provides all contract recordkeeping services.
 
ADMINISTRATIVE EXPENSE CHARGE
 
The Company will deduct an Administrative Expense Charge which is equal, on an
annual basis to .10% of the daily net assets in the Variable Account. This
charge is designed to cover actual administrative expenses which exceed the
revenues from the Contract Maintenance Charge. The Company does not intend to
profit from this charge. The Company believes that the Administrative Expense
Charge and Contract Maintenance Charge have been set at a level that will
recover no more than the actual costs associated with administering the
Contract. There is no necessary relationship between the amount of
administrative charge imposed on a given Contract and the amount of expenses
that may be attributable to that Contract.
 
MORTALITY AND EXPENSE RISK CHARGE
 
   
A Mortality and Expense Risk Charge will be deducted daily at a rate equal on an
annual basis to 1.25% of the daily net assets in the Variable Account. The
Company estimates that .85% is attributed to the assumption of mortality risks
and .40% is attributed to the assumption of expense risks. For Contracts with an
optional Death Benefit provision, the Mortality and Expense Risk Charge will be
deducted daily, at a rate equal on an annual basis, to 1.38% of the daily net
assets in the Variable Account. The assessment of the additional .13% for either
of the two optional Death Benefits is attributed to the assumption of additional
mortality risks. (see pages 17-18, for a full description of Death Benefit
options) THE COMPANY GUARANTEES THAT THE AMOUNT OF THIS CHARGE WILL NOT INCREASE
OVER THE LIFE OF THE CONTRACT.
    
 
If the Mortality and Expense Risk Charge is insufficient to cover the Company's
mortality costs and excess expenses, the Company will bear the loss. If the
Charge is more than sufficient, the Company will retain the balance as profit.
The Company currently expects a profit from this charge. Any such profit, as
well as any other profit realized by the Company and held in its general
account, (which supports insurance and annuity obligations), would be available
for any proper corporate purpose, including, but not limited to, payment of
distribution expenses.
 
The mortality risk arises from the Company's guarantee to cover all death
benefits and to make Income Payments in accordance with the Income Payment
Tables, thus, relieving the Annuitants of the risk of outliving funds
accumulated for retirement.
 
The expense risk arises from the possibility that the Contract Maintenance and
Early Withdrawal Charges, both of which are guaranteed not to increase, will be
insufficient to cover actual administrative expenses.
 
                                       16
<PAGE>
TAXES
 
The Company will deduct any state premium taxes incurred or other taxes incurred
relative to the Contract (collectively referred to as "premium taxes") either at
the Payout Start Date, or when a total withdrawal occurs. Current premium tax
rates range from 0 to 3.5%. The Company reserves the right to deduct any
incurred premium taxes from the Purchase Payments.
 
At the Payout Start Date, any charge for premium taxes will be deducted from
each Investment Alternative in the proportion that the Owner's interest in the
Investment Alternative bears to the total Cash Value.
 
DEAN WITTER VARIABLE INVESTMENT SERIES ("FUND") EXPENSES
 
A complete description of the expenses and deductions from the Portfolios are
found in the Fund's prospectus which is attached to this prospectus.
 
BENEFITS UNDER THE CONTRACT
- -----------------------------------------------------------
 
DEATH BENEFITS PRIOR TO THE PAYOUT START DATE
If any Owner or the last surviving Annuitant dies prior to the Payout Start
Date, and a Death Benefit is elected, it will be paid to the new Owner or
Beneficiary. If requested to be paid in a lump sum within 180 days from the Date
of Death, the Death Benefit will be the greatest of: (a) the sum of all Purchase
Payments less any amounts deducted in connection with partial withdrawals
including any applicable Early Withdrawal Charges or premium taxes; or (b) the
Cash Value on the date we receive Due Proof of Death, or (c) the Cash Value on
the most recent Death Benefit Anniversary less any amounts deducted in
connection with partial withdrawals, including any applicable Early Withdrawal
Charges and premium taxes deducted from the Cash Value, since that anniversary.
The Death Benefit Anniversary is every sixth Contract Anniversary. For example,
the 6th, 12th and 18th Contract Anniversaries are the first three Death Benefit
Anniversaries.
   
If the Enhanced Death Benefit option or the Performance Death Benefit option is
selected, it applies only at the death of the Owner. It does not apply to the
death of the Annuitant if different from the Owner unless the Owner is a
non-natural Owner. For Contracts with either optional Death Benefit provision,
the Death Benefit will be the greater of (a) through (c) above, or (d) the
optional Death Benefit selected.
    
 
   
The Enhanced Death Benefit on the date of issue is equal to the initial purchase
payment. On each Contract Anniversary, but not beyond the Contract Anniversary
preceding all Owners' 75th birthdays, the Enhanced Death Benefit will be
recalculated as follows:
    
 
    The Enhanced Death Benefit as of the prior Contract Anniversary multiplied
    by 1.05 which results in an increase of 5% annually.
 
Further, for all ages, the Enhanced Death Benefit will be adjusted on each
Contract Anniversary, or upon receipt of a death claim, as follows:
 
    The Enhanced Death Benefit will be reduced by the percentage of any Cash
    Value withdrawn since the prior Contract Anniversary.
 
    Any additional purchase payments since the prior Contract Anniversary will
    be added.
 
   
The Performance Death Benefit option is equal to the greatest of the anniversary
values as of the date the Company calculates the death benefit. The anniversary
value is equal to the Cash Value on a Contract Anniversary:
    
 
   
    1.  Increased by any purchase payments made since the anniversary; and
    
 
   
    2.  Reduced by an adjustment for any partial withdrawals made since the
        anniversary.
    
 
   
    This adjustment is equal to the Cash Value on a Contract Anniversary
    multiplied by the ratio of the withdrawal amount to the Cash Value just
    before the withdrawal.
    
 
   
On each Contract Anniversary, the Performance Death Benefit will be recalculated
until the oldest Owner or the Annuitant, if the Owner is a non-natural Owner,
attains age 85. The Performance Death Benefit on the date of issue is equal to
the initial purchase payment. In the absence of any withdrawals or purchase
payments, the Performance Death Benefit will be the greatest of all Contract
Anniversary Cash Values on or before the date the Company calculates the death
benefit.
    
 
   
Neither the Enhanced Death Benefit nor the Performance Death Benefit will ever
be greater than the maximum death benefit allowed by any non-forfeiture laws
which govern the Contract.
    
 
The Company will not settle any death claim until it receives Due Proof of
Death. If an Owner dies prior to the Payout Start Date, the new Owner will be
the surviving Owner, if any, otherwise the new Owner will be the Beneficiary.
Generally, this new Owner has the following options:
 
    1.  The new Owner may elect, within 180 days of the date of receipt by the
Company of Due Proof of Death, to receive the Death Benefit in a lump sum;
 
    2.  The new Owner may elect, within 180 days of the date of receipt by the
Company of Due Proof of Death, to receive the Settlement Value (the Settlement
Value is the Cash Value less any
 
                                       17
<PAGE>
applicable Early Withdrawal Charges and premium tax on the date payment is
requested) payable within five years of the date of death.
 
    3.  The new Owner may elect to apply an amount equal to the Death Benefit to
one of the income plans. Payments must begin within one year of the date of
death and must be over the life of the new Owner, or a period not to exceed the
life expectancy of the new Owner.
 
   
    4.  If the new Owner is the spouse of the deceased Owner, the new Owner may
elect one of the above options or may continue the Contract. If the contract is
continued prior to the Payout Start Date, the surviving spouse may make a single
withdrawal of any amount within one year of the date of death without incurring
an Early Withdrawal Charge.
    
 
If the new Owner who is not the spouse of the deceased Owner does not make one
of these elections, the Settlement Value will be paid in a lump sum to the new
Owner five years after the date of death.
 
If the new Owner is a non-natural person, then the new Owner must receive the
Death Benefit in a lump sum, and the options listed above are not available.
 
If any Annuitant dies who is not also an Owner, the Owner must elect an
applicable option listed below. If the option selected is 1(a) or 1(b)(ii)
below, the new Annuitant will be the youngest Owner, unless the Owner names a
different Annuitant.
 
    1.  If the Owner is a natural person:
 
       a. The Owner may choose to continue the Contract as if the death had not
    occurred; or
 
       b. If the Company receives due proof of death within 180 days of the date
    of the Annuitant's death, then the Owner may alternatively choose to:
 
           i.  Receive the Death Benefit in a lump sum; or
 
           ii. Apply the Death Benefit to an income plan which must begin within
        one year of the date of death and must be for a period equal to or less
        than the life expectancy of the Owner.
 
    2.  If the Owner is a non-natural person: The Owner must receive the Death
Benefit in a lump sum.
 
The value of the Death Benefit will be determined at the end of the Valuation
Period during which the Company receives a complete request for payment of the
Death Benefit, which includes Due Proof of Death.
 
DEATH BENEFITS AFTER THE PAYOUT START DATE
   
If the Annuitant and Joint Annuitant, if applicable, die after the Payout Start
Date, the Company will pay the Death Benefit, if any, contained in the
particular income plan.
    
 
If the Owner, who is not the Annuitant, dies after the Payout Start Date,
payments will continue to be made under the particular income plan. The
Beneficiary will be the recipient of any such payment.
 
INCOME PAYMENTS
- -----------------------------------------------------------
 
PAYOUT START DATE
 
   
The Payout Start Date is the day that Income Payments will start under the
Contract. The Owner may change the Payout Start Date at any time by notifying
the Company in writing of the change at least 30 days before the current Payout
Start Date. The Payout Start Date must be (a) at least a month after the issue
date; (b) the first day of a calendar month; and (c) no later than the first day
of the calendar month after the Annuitant reaches age 90, or the 10th
anniversary date, if later.
    
 
   
Unless the Owner notifies the Company in writing otherwise, the Payout Start
Date will be the later of the first day of the calendar month after the
Annuitant reaches age 90 or the 10th anniversary date.
    
 
AMOUNT OF VARIABLE ANNUITY INCOME PAYMENTS
 
The amount of Variable Annuity Income Payments depends upon the investment
experience of the Portfolios selected by the Owner, any premium taxes, the age
and sex of the Annuitant(s), and the income plan chosen. The Company guarantees
that the Income Payments will not be affected by (1) actual mortality experience
and (2) the amount of the Company's administration expenses.
 
The Contracts offered by this Prospectus (except in states which require unisex
annuity tables) contain life annuity tables that provide for different benefit
payments to men and women of the same age. Nevertheless, in accordance with the
U.S. Supreme Court's decision in ARIZONA GOVERNING COMMITTEE V. NORRIS, in
certain employment-related situations, annuity tables that do not vary on the
basis of sex may be used. Accordingly, if the Contract is to be used in
connection with an employment-related retirement or benefit plan, consideration
should be given, in consultation with legal counsel, to the impact of NORRIS on
any such plan before making any contributions under these Contracts. For
qualified plans where it is appropriate, a unisex endorsement is available.
 
The sum of Income Payments made may be more or less than the total Purchase
Payments made because (a) Variable Annuity Income Payments vary with the
investment results of the underlying Portfolios; (b) the Owner bears the
investment risk with respect to all amounts allocated to the Variable Account,
and (c) Annuitants may die before the actuarially expected Date of Death. As
such, the total amount of Income Payments cannot be predicted.
 
                                       18
<PAGE>
The duration of the income plan may affect the dollar amounts of each Income
Payment. For example, if an income plan guaranteed for life is chosen, the
Income Payments may be greater or lesser than Income Payments under an income
plan for a specified period depending on the life expectancy of the Annuitant.
 
If the actual net investment experience is less than the assumed investment
rate, then the dollar amount of the Income Payments will decrease. The dollar
amount of the Income Payments will stay level if the net investment experience
equals the assumed investment rate and the dollar amount of the Income Payments
will increase if the net investment experience exceeds the assumed investment
rate. For purposes of the Variable Annuity Income Payments, the assumed
investment rate is found in the Contract.
 
If the Cash Value to be applied to an income plan is less than $2,000, or if the
monthly payments determined under the Income Plan are less than $20, the Company
may pay the Cash Value in a lump sum or change the payment frequency to an
interval which results in Income Payments of at least $20.
 
INCOME PLANS
 
The Owner may elect a completely Fixed Annuity, a completely Variable Annuity or
a combination Fixed and Variable Annuity. Up to 30 days before the Payout Start
Date, the Owner may change the income plan or request any other form of Income
Plan agreeable to both the Company and the Owner. Subsequent changes will not be
permitted. If an income plan is chosen which depends on the Annuitant or Joint
Annuitant's life, proof of age will be required before Income Payments begin.
Premium taxes may be assessed. The income plans include:
 
INCOME PLAN 1--LIFE WITH PAYMENTS GUARANTEED FOR 120 MONTHS
 
Monthly payments will be made for as long as the Annuitant lives. If the
Annuitant dies before 120 monthly payments have been made, the remainder of the
120 guaranteed monthly payments will be paid to the Owner, or if deceased, to
the surviving Beneficiary.
 
INCOME PLAN 2--JOINT AND LAST SURVIVOR
 
Monthly payments beginning on the Payout Start Date will be made for as long as
either the Annuitant or Joint Annuitant is living. It is possible under this
option that only one monthly payment will be made if the Annuitant and Joint
Annuitant both die before the second payment is made, or only two monthly
payments will be made if they both die before the third payment, and so forth.
 
INCOME PLAN 3--PAYMENTS FOR A SPECIFIED PERIOD
 
Monthly payments beginning on the Payout Start Date will be made for a specified
period. An Early Withdrawal Charge may apply if the specified period is less
than 120 months. Payments under this option do not depend on the continuation of
the Annuitant's life. If the Owner dies before the end of the specified period,
the remaining payments will be paid to the surviving beneficiary. The Mortality
and Expense Risk Charge is deducted from payments even though the Company does
not bear any mortality risk. If Income Plan 3 is chosen and the proceeds are
derived from the Variable Account, the Owner or Beneficiary may surrender the
Contract at any time by notifying the Company in writing.
 
In the event that an income plan is not selected, the Company will make Income
Payments in accordance with Income Plan 1. At the Company's discretion, other
income plans may be available upon request. The Company currently uses
sex-distinct annuity tables. However, if legislation is passed by Congress or
the states, the Company reserves the right to use Income Payment tables which do
not distinguish on the basis of sex.
 
THE FIXED ACCOUNT
- -----------------------------------------------------------
 
CONTRIBUTIONS UNDER THE FIXED PORTION OF THE ANNUITY CONTRACT AND TRANSFERS TO
THE FIXED PORTION BECOME PART OF THE GENERAL ACCOUNT OF THE COMPANY, WHICH
SUPPORTS INSURANCE AND ANNUITY OBLIGATIONS. BECAUSE OF EXEMPTIVE AND
EXCLUSIONARY PROVISIONS, INTERESTS IN THE GENERAL ACCOUNT HAVE NOT BEEN
REGISTERED UNDER THE SECURITIES ACT OF 1933 ("1933 ACT"), NOR IS THE GENERAL
ACCOUNT REGISTERED AS AN INVESTMENT COMPANY UNDER THE INVESTMENT COMPANY ACT OF
1940 ("1940 ACT"). ACCORDINGLY, NEITHER THE GENERAL ACCOUNT NOR ANY INTERESTS
THEREIN ARE GENERALLY SUBJECT TO THE PROVISIONS OF THE 1933 OR 1940 ACTS AND THE
COMPANY HAS BEEN ADVISED THAT THE STAFF OF THE SECURITIES AND EXCHANGE
COMMISSION HAS NOT REVIEWED THE DISCLOSURES IN THIS PROSPECTUS WHICH RELATE TO
THE FIXED PORTION. DISCLOSURES REGARDING THE FIXED PORTION OF THE ANNUITY
CONTRACT AND THE GENERAL ACCOUNT, HOWEVER, MAY BE SUBJECT TO CERTAIN GENERALLY
APPLICABLE PROVISIONS OF THE FEDERAL SECURITIES LAWS RELATING TO THE ACCURACY
AND COMPLETENESS OF STATEMENTS MADE IN PROSPECTUSES.
 
GENERAL DESCRIPTION
 
   
Contributions made to the Fixed Account are invested in the general account of
the Company. The general account is made up of all of the general assets of the
Company, other than those in the Variable Account and any other segregated asset
account. Instead of the Owner bearing the investment risk as is the case for
amounts in the Variable Account, the Company bears the full investment risk for
all amounts contributed to the general account. The Company has sole discretion
to invest the assets of the general account, subject to applicable law. The
Company guarantees that the amounts allocated to the Fixed Account will be
credited interest at a net effective interest rate of at least the minimum
guaranteed rate found in the Contract. (This interest rate is net of separate
account asset based charges of 1.35% or 1.48% if an optional Death Benefit has
been selected). Currently the amount of interest credited in excess of the
guaranteed rate
    
 
                                       19
<PAGE>
will vary periodically in the sole discretion of the Company. Any interest held
in the general account does not entitle an Owner to share in the investment
experience of the general account.
 
Money deposited in the Fixed Account earns interest at the current rate in
effect at the time of allocation or transfer for the Guarantee Period. After the
Guarantee Period, a renewal rate will be declared. Subsequent renewal dates will
be on anniversaries of the first renewal date. On or about each renewal date,
the Company will notify the Owner of the interest rate(s). The interest rate
will be guaranteed by the Company for a full year and will not be less than the
guaranteed rate found in the Contract. The Company may declare more than one
interest rate for different monies based upon the date of allocation or transfer
to the Fixed Account and based upon the Guarantee Period.
 
   
The Company will offer a one year Guarantee Period. Additional Guarantee Periods
are offered at the sole discretion of the Company. The Company currently offers
a 1 year and a 6 year Guarantee Period. The Company is also currently offering a
Dollar Cost Averaging Fixed Account.
    
 
   
THE DOLLAR COST AVERAGING FIXED ACCOUNT
    
   
Purchase Payments may also be allocated to the Dollar Cost Averaging Fixed
Account. Transfers are not allowed into the Dollar Cost Averaging Fixed Account.
Once Purchase Payments have been allocated to the Dollar Cost Averaging Fixed
Account, interest is earned for a one year period at a current rate in effect at
the time of allocation. This rate may be different from the rate of the 1 year
Fixed Account Guarantee Period discussed above. After the one year period, a
renewal rate will be declared. Subsequent renewal dates will be every twelve
months for each Purchase Payment. The renewal rate will be guaranteed by the
Company for a full year and will not be less than the minimum guaranteed rate
found in the Contract.
    
 
ANY INTEREST CREDITED TO AMOUNTS ALLOCATED TO THE FIXED ACCOUNT IN EXCESS OF THE
GUARANTEED RATE FOUND IN THE CONTRACT WILL BE DETERMINED IN THE SOLE DISCRETION
OF THE COMPANY.
 
TRANSFERS, SURRENDERS, AND WITHDRAWALS
 
   
Amounts may be transferred from the Sub-Accounts of the Variable Account to the
Fixed Account (but not the Dollar Cost Averaging Fixed Account), and prior to
the Payout Start Date amounts may also be transferred from the Fixed Account to
Sub-Accounts of the Variable Account.
    
 
   
The maximum amount in any Contract Year which may be transferred from the Fixed
Account to the Variable Account or between Guarantee Periods of the Fixed
Account is limited to the greater of (1) 25% of the value in the Fixed Account
as of the most recent Contract Anniversary; if 25% of the value as of the most
recent Contract Anniversary is greater than zero but less than $1,000, then up
to $1,000 may be transferred; or (2) 25% of the sum of all Purchase Payments and
transfers to the Fixed Account as of the most recent Contract Anniversary. These
restrictions do not apply to transfers pursuant to the Dollar Cost Averaging
Program. Also, the Company reserves the right to waive these restrictions.
    
 
If the first renewal interest rate is less than the current rate that was in
effect at the time money was allocated or transferred to the Fixed Account, the
transfer restriction for that money and the accumulated interest thereon will be
waived during the 60-day period following the first renewal date.
 
After the Payout Start Date no transfers may be made from the Fixed Account.
Transfers from the Variable Account to the Fixed Account may not be made for six
months after the Payout Start Date and may be made thereafter only once every
six months.
 
Surrenders and withdrawals from the Fixed Account may be delayed for up to six
months. After the Payout Start Date no surrenders or withdrawals may be made
from the Fixed Account.
 
GENERAL MATTERS
- -----------------------------------------------------------
 
OWNER
 
The Owner has the sole right to exercise all rights and privileges under the
Contract, except as otherwise provided in the Contract. These rights include the
right to name and change the Owner, Beneficiary and Annuitant. The Annuitant can
be changed only if the Owner is a natural person.
 
Generally, an Owner who is not a natural person is required to include in income
each year any increase in the Cash Value to the extent the increase is
attributable to contributions to the Contract made after February 28, 1986.
 
BENEFICIARY
 
Subject to the terms of any irrevocable Beneficiary, the Owner may change the
Beneficiary while the Annuitant is living by notifying the Company in writing.
Any change will be effective at the time it is signed by the Owner, whether or
not the Annuitant is living when the change is received by the Company. The
Company will not, however, be liable as to any payment or settlement made prior
to receiving the written notice.
 
Unless otherwise provided in the Beneficiary designation, the rights of any
Beneficiary predeceasing the Annuitant will revert to the Owner or the Owner's
estate. Multiple Beneficiaries may be
 
                                       20
<PAGE>
named. Unless otherwise provided in the Beneficiary designation, if more than
one Beneficiary survives the Annuitant, the surviving Beneficiaries will share
equally in any amounts due.
 
DELAY OF PAYMENTS
 
Payment of any amounts due from the Variable Account under the Contract will
occur within seven days, unless:
 
       1. The New York Stock Exchange is closed for other than usual weekends or
    holidays, or trading on the Exchange is otherwise restricted;
 
       2. An emergency exists as defined by the Securities and Exchange
    Commission; or
 
       3. The Securities and Exchange Commission permits delay for the
    protection of the Owners.
   
For payment or transfers from the Fixed Account, see page 20.
    
 
ASSIGNMENTS
 
The Owner may not assign an interest in a Contract as collateral or security for
a loan. Otherwise, the Owner may assign benefits under the Contract prior to the
Payout Start Date. No Beneficiary may assign benefits under the Contract until
they are due. No assignment will bind the Company unless it is signed by the
Owner and filed with the Company. The Company is not responsible for the
validity of an assignment.
 
MODIFICATION
 
The Company may not modify the Contract without the consent of the Owner except
to make the Contract meet the requirements of the Investment Company Act of
1940, or to make the Contract comply with any changes in the Internal Revenue
Code or required by the Code or by any other applicable law.
 
CUSTOMER INQUIRIES
 
The Owners or any persons interested in the Contract may make inquiries
regarding the Contract by calling or writing their Dean Witter Account
Executive.
 
FEDERAL TAX MATTERS
- -----------------------------------------------------------
 
INTRODUCTION
THE FOLLOWING DISCUSSION IS GENERAL AND IS NOT INTENDED AS TAX ADVICE. THE
COMPANY MAKES NO GUARANTEE REGARDING THE TAX TREATMENT OF ANY CONTRACT OR
TRANSACTION INVOLVING A CONTRACT. Federal, state, local and other tax
consequences of ownership or receipt of distributions under an annuity contract
depend on the individual circumstances of each person. If you are concerned
about any tax consequences with regard to your individual circumstances, you
should consult a competent tax adviser.
 
TAXATION OF ANNUITIES IN GENERAL
 
Tax Deferral. Generally, an annuity contract owner is not taxed on increases in
the Contract Value until a distribution occurs. This rule applies only where (1)
the Owner is a natural person, (2) the investments of the Variable Account are
"adequately diversified" in accordance with Treasury Department ("Treasury")
regulations and (3) the Company, instead of the annuity Owner, is considered the
Owner of the Variable Account assets for federal income tax purposes.
 
   
Non-Natural Owners. As a general rule, annuity contracts owned by non-natural
persons are not treated as annuity contracts for federal income tax purposes and
the income on such Contracts is taxed as ordinary income received or accrued by
the Owner during the taxable year. There are several exceptions to the general
rule for Contracts owned by non-natural persons which are discussed in the
Statement of Additional Information.
    
 
Diversification Requirements. For a Contract to be treated as an annuity for
federal income tax purposes, the investments in the Variable Account must be
"adequately diversified" in accordance with the standards provided in the
Treasury regulations. If the investments in the Variable Account are not
adequately diversified, then the Contract will not be treated as an annuity
contract for federal income tax purposes and the Contract Owner will be taxed on
the excess of the Contract Value over the investment in the Contract. Although
the Company does not have control over the Fund or its investments, the Company
expects the Fund to meet the diversification requirements.
 
   
Ownership Treatment. In connection with the issuance of the regulations on the
adequate diversification standards, the Department of the Treasury announced
that the regulations do not provide guidance concerning the extent to which
contract owners may direct their investments among sub-accounts of a Variable
Account. The Internal Revenue Service has previously stated in published rulings
that a variable contract owner will be considered the owner of separate account
assets if the owner possesses incidents of ownership in those assets such as the
ability to exercise investment control over the assets. At the time the
diversification regulations were issued, the Treasury Department announced that
guidance would be issued in the future regarding the extent that owners could
direct their investments among sub-accounts without being treated as owners of
the underlying assets of the Variable Account. As of the date of this
prospectus, no such guidance has been issued.
    
 
                                       21
<PAGE>
   
The ownership rights under this contract are similar to, but different in
certain respects from, those described by the Service in rulings in which it was
determined that contract owners were not owners of separate account assets. For
example, the owner of this contract has the choice of more investment options to
which to allocate premiums and contract values, and may be able to transfer
among investment options more frequently than in such rulings. These differences
could result in the contract owner being treated as the owner of the Variable
Account. In those circumstances, income and gain from the Variable Account
assets would be includible in the Contract Owner's gross income. In addition,
the Company does not know what standards will be set forth in the regulations or
rulings which the Treasury Department has stated it expects to issue. It is
possible that Treasury Department's position, when announced, may adversely
affect the tax treatment of existing contracts. The Company, therefore, reserves
the right to modify the contract as necessary to attempt to prevent the contract
owner from being considered the federal tax owner of the assets of the Variable
Account. However, the Company makes no guarantee that such modification to the
contract will be successful.
    
   
Delayed Maturity Date. If the contract's scheduled maturity date is at a time
when the annuitant has reached an advanced age, e.g., past age 85, it is
possible that the contract would not be treated as an annuity. In that event,
the income and gains under the contract would be currently includible in the
owner's income.
    
 
   
Taxation of Partial and Full Withdrawals. In the case of a partial withdrawal
under a Non-Qualified Contract, amounts received are taxable to the extent the
Contract value, without regard to surrender charges, exceeds the investment in
the Contract. In the case of a partial withdrawal under a Qualified Contract,
the portion of the payment that bears the same ratio to the total payment that
the investment in the Contract bears to the Contract value, can be excluded from
income. In the case of a full withdrawal under a Non-Qualified Contract or a
Qualified Contract, the amount received will be taxable only to the extent it
exceeds the investment in the Contract. If an individual transfers an annuity
contract without full and adequate consideration to a person other than the
individual's spouse (or to a former spouse incident to a divorce), the Owner
will be taxed on the difference between the Contract Value and the investment in
the Contract at the time of transfer. Other than in the case of certain
Qualified Contracts, any amount received as a loan under a Contract, and any
assignment or pledge (or agreement to assign or pledge) of the Contract Value is
treated as a withdrawal of such amount or portion.
    
 
Taxation of Annuity Payments. Generally, the rule for income taxation of
payments received from an annuity contract provides for the return of the
Owner's investment in the Contract in equal tax-free amounts over the payment
period. The balance of each payment received is taxable. In the case of Variable
Annuity payments, the amount excluded from taxable income is determined by
dividing the investment in the Contract by the total number of expected
payments. In the case of fixed annuity payments, the amount excluded from income
is determined by multiplying the payment by the ratio of the investment in the
Contract (adjusted for any refund feature or period certain) to the total
expected value of annuity payments for the term of the Contract.
 
Taxation of Annuity Death Benefits. Amounts may be distributed from an annuity
contract because of the death of an Owner or Annuitant. Generally, such amounts
are includible in income as follows: (1) if distributed in a lump sum, the
amounts are taxed in the same manner as a full withdrawal or (2) if distributed
under an annuity option, the amounts are taxed in the same manner as an annuity
payment.
 
   
Penalty Tax on Premature Distributions. There is a 10% penalty tax on the
taxable amount of any premature distribution from a non-qualified annuity
contract. The penalty tax generally applies to any distribution made prior to
the owner attaining age 59 1/2. However, there should be no penalty tax on
distributions to Owners (1) made on or after the Owner attains age 59 1/2; (2)
made as a result of the Owner's death or disability; (3) made in substantially
equal periodic payments over life or life expectancy; or (4) made under an
immediate annuity. Similar rules apply for distributions from Qualified
Contracts. Please see the Statement of Additional Information for a discussion
of other situations in which the penalty tax may not apply.
    
 
   
Aggregation of Annuity Contracts. All Non-Qualified deferred annuity Contracts
issued by the Company (or its affiliates) to the same Owner during any calendar
year will be aggregated and treated as one annuity Contract for purposes of
determining the taxable amount of a distribution.
    
 
TAX QUALIFIED CONTRACTS
 
   
Annuity contracts may be used as investments with certain tax qualified plans
such as: (1) Individual Retirement Annuities under Section 408(b) of the Code;
(2) Simplified Employee Pension Plans under Section 408(k) of the Code; (3)
Savings Incentive Match Plans for Employees (SIMPLE) Plans under Section 408(p)
of the Code; (4) Tax Sheltered Annuities under Section 403(b) of the Code; (5)
Corporate and Self Employed Pension and Profit Sharing Plans; and (6) State and
Local Government and Tax-Exempt Organization Deferred Compensation Plans. In the
case of certain tax qualified plans, the terms of the plans may govern the right
to benefits, regardless of the terms of the contract.
    
 
Restrictions Under Section 403(b) Plans. Section 403(b) of the Code provides for
tax-deferred retirement savings plans for employees of certain non-profit and
educational organizations. In accordance with the requirements of Section
403(b), any annuity contract used for a 403(b) plan must provide that
distributions attributable to salary reduction contributions made after
12/31/88, and all earnings on salary reduction contributions, may be made only
after the employee attains age 59 1/2, separates from service, dies, becomes
disabled or on the account of hardship (earnings on salary reduction
contributions may not be distributed on the account of hardship).
 
INCOME TAX WITHHOLDING
 
The Company is required to withhold federal income tax at a rate of 20% on all
"eligible rollover distributions" unless an individual elects to make a "direct
rollover" of such amounts to another qualified plan or Individual Retirement
Account or Annuity ("IRA"). Eligible rollover distributions generally include
all distributions from Qualified Contracts, excluding IRAs, with the exception
of (1) required minimum distributions, or (2) a series of
 
                                       22
<PAGE>
substantially equal periodic payments made over a period of at least 10 years,
or the life (joint lives) of the participant (and beneficiary). For any
distributions from non-qualified annuity contracts, or distributions from
Qualified Contracts which are not considered eligible rollover distributions,
the Company may be required to withhold federal and state income taxes unless
the recipient elects not to have taxes withheld and properly notifies the
Company of such election.
 
VOTING RIGHTS
- -----------------------------------------------------------
 
The Owner or anyone with a voting interest in the Sub-Account of the Variable
Account may instruct the Company on how to vote at shareholder meetings of the
Fund. The Company will solicit and cast each vote according to the procedures
set up by the Fund and to the extent required by law. The Company reserves the
right to vote the eligible shares in its own right, if subsequently permitted by
the Investment Company Act of 1940, its regulations or interpretations thereof.
 
Before the Payout Start Date, the Owner holds the voting interest in the
Sub-Account. (The number of votes for the Owner will be determined by dividing
the Cash Value attributable to a Sub-Account by the net asset value per share of
the applicable eligible Portfolio.)
 
After the Payout Start Date, the person receiving Income Payments has the voting
interest. After the Payout Start Date, the votes decrease as Income Payments are
made and as the reserves for the Contract decrease. That person's number of
votes will be determined by dividing the reserve for such Contract allocated to
the applicable Sub-Account by the net asset value per share of the corresponding
eligible Portfolio.
 
SALES COMMISSION
- -----------------------------------------------------------
 
From its profits the Company may pay a maximum sales commission of 6.0% of
Purchase Payments and an annual sales administration expense allowance of up to
0.125% of the average net assets of the Fixed Account to Dean Witter Reynolds
Inc., the principal underwriter of the Contracts. Dean Witter will pay annually
to its Registered Representatives from its profits, an amount equal to .10% of
the net assets of the Variable Account attributable to Contracts.
 
                                       23
<PAGE>
                      STATEMENT OF ADDITIONAL INFORMATION
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                                                         Page
                                                                                                          ---
<S>                                                                                                   <C>
The Contract........................................................................................           3
    Purchase of Contracts...........................................................................           3
    Value of Variable Account Accumulation Units....................................................           3
    Performance Data................................................................................           3
Standardized Total Return...........................................................................           4
    Other Total Returns.............................................................................           5
    Transfers.......................................................................................           6
    Tax-free Exchanges (1035 Exchanges, Rollovers, Transfers).......................................           6
General Matters.....................................................................................           7
    Recordkeeping Services..........................................................................           7
    Additions, Deletions or Substitution of Investments.............................................           7
    Reinvestment....................................................................................           7
    Incontestability................................................................................           7
    Settlements.....................................................................................           7
    Safekeeping of the Variable Account's Assets....................................................           8
    Experts.........................................................................................           8
    Legal Matters...................................................................................           8
Federal Tax Matters.................................................................................           8
    Introduction....................................................................................           8
    Taxation of Northbrook Life Insurance Company...................................................           8
    Exceptions to the Non-Natural Owner Rule........................................................           9
    Penalty Tax on Premature Distributions..........................................................           9
    IRS Required Distribution at Death Rules........................................................           9
    Qualified Plans.................................................................................           9
Types of Qualified Plans............................................................................          10
    Individual Retirement Annuities.................................................................          10
    Simplified Employee Pension Plans...............................................................          10
    Tax Sheltered Annuities.........................................................................          10
    Corporate and Self-Employed Pension and Profit Sharing Plans....................................          10
    State and Local Government and Tax-Exempt Organization Deferred Compensation Plans..............          10
Voting Rights.......................................................................................          10
Sales Commissions...................................................................................          11
Financial Statements................................................................................         F-1
</TABLE>
 
                                       24
<PAGE>
ORDER FORM
- -----------------------------------------------------------
 
/ / Please send me a copy of the most recent Statement of Additional Information
    for the Northbrook Variable Annuity II.
 
<TABLE>
<S>                       <C>
- ------------------------  ---------------------------------------------
         (Date)                               (Name)
 
                          ---------------------------------------------
                                         (Street Address)
 
                          ---------------------------------------------
                          (City)           (State)           (Zip Code)
</TABLE>
 
Send to:  Northbrook Life Insurance Company
          P.O. Box 94040
          Palatine, IL 60094-4040
 
          Attn:  Annuity Services
 
                                       25
<PAGE>
                      (This page intentionally left blank)
 
                                       26
<PAGE>

                      STATEMENT OF ADDITIONAL INFORMATION
                     NORTHBROOK VARIABLE ANNUITY ACCOUNT II
                                       OF
                       NORTHBROOK LIFE INSURANCE COMPANY
                                 P.O. BOX 94040
                            PALATINE, IL 60094-4040

 
                GROUP AND INDIVIDUAL VARIABLE ANNUITY CONTRACTS
                                 DISTRIBUTED BY
                           DEAN WITTER REYNOLDS INC.
                             TWO WORLD TRADE CENTER
                            NEW YORK, NEW YORK 10048
                              -------------------
 
    This  Statement of Additional Information supplements the information in the
Prospectus for  the  group  or individual  Flexible  Premium  Deferred  Variable
Annuity   Contract  (as  used  herein  "Contract"  includes  "Certificates"  and
"Contracts") offered by Northbrook Life Insurance Company ("Company"), a  wholly
owned  subsidiary of Allstate  Life Insurance Company.  The group and individual
Contract is  primarily  designed  to  aid  individuals  in  long-term  financial
planning  and it can be  used for retirement planning  regardless of whether the
plan qualifies for special federal income tax treatment.
 
    THIS STATEMENT OF ADDITIONAL INFORMATION IS  NOT A PROSPECTUS AND SHOULD  BE
READ ONLY IN CONJUNCTION WITH THE PROSPECTUS FOR THE CONTRACT.
 
    You  may obtain  a copy  of the  Prospectus from  Dean Witter  Reynolds Inc.
("Dean Witter"), the principal underwriter  and distributor of the Contract,  by
calling or writing Dean Witter at the address listed above.
 
   
    The Prospectus, dated May 1, 1997, has been filed with the United 
States Securities and Exchange Commission.

 

                            DATED MAY 1, 1997
    

<PAGE>

                               TABLE OF CONTENTS

   
<TABLE>
<CAPTION>
                                                       PAGE
                                                       -----
<S>                                                 <C>
THE CONTRACT......................................           3
  Purchase of Contracts...........................           3
  Value of Variable Account Accumulation Units....           3
  Performance Data................................           3
STANDARDIZED TOTAL RETURN.........................           4
  Other Total Returns.............................           5
  Transfers.......................................           6
  Tax-free Exchanges (1035 Exchanges, Rollovers
   and Transfers).................................           6
GENERAL MATTERS...................................           7
  Recordkeeping Services..........................           7
  Additions, Deletions or Substitutions of
   Investments....................................           7
  Reinvestment....................................           7
  Incontestability................................           7
  Settlements.....................................           7
  Safekeeping of the Variable Account's Assets....           8
  Experts.........................................           8
  Legal Matters...................................           8
FEDERAL TAX MATTERS...............................           8
 
<CAPTION>
                                                       PAGE
                                                       -----
<S>                                                 <C>
 
  Introduction....................................           8
  Taxation of Northbrook Life Insurance Company...           8
  Exceptions to the Non-Natural Owner Rule........           9
  Penalty Tax on Premature Distributions..........           9
  IRS Required Distribution at Death Rules........           9
  Qualified Plans.................................           9
TYPES OF QUALIFIED PLANS..........................          10
  Individual Retirement Annuities.................          10
  Simplified Employee Pension Plans...............          10
  Tax Sheltered Annuities.........................          10
  Corporate and Self-Employed Pension and Profit
  Sharing Plans...................................          10
  State and Local Government and Tax-Exempt
  Organization Deferred Compensation Plans........          10
VOTING RIGHTS.....................................          10
SALES COMMISSIONS.................................          11
FINANCIAL STATEMENTS..............................         F-1
</TABLE>
    

 
                                       2
<PAGE>
THE CONTRACT
- --------------------------------------------------------------------------------
 
PURCHASE OF CONTRACTS
 
    The  Contracts are offered to the  public through brokers licensed under the
federal securities laws and state insurance laws. The offering of the  Contracts
is  continuous and the Company does not anticipate discontinuing the offering of
the Contracts.  However,  the Company  reserves  the right  to  discontinue  the
offering of the Contracts.
 
VALUE OF VARIABLE ACCOUNT ACCUMULATION UNITS
 
    The  value of  Variable Account Accumulation  Units will  vary in accordance
with investment experience of  the Portfolio in  which the Sub-Account  invests.
The  number of such Accumulation Units credited to a Contract will not, however,
change as a result of any fluctuations in the Accumulation Unit value.
 
    The Accumulation  Units in  each  Sub-Account of  the Variable  Account  are
valued  separately. The value of Accumulation Units in any Valuation Period will
depend  upon  the  investment  performance  of  the  shares  purchased  by  each
Sub-Account  in a particular Portfolio.  The value of an  Accumulation Unit in a
Sub-Account for any Valuation Period equals the  value of such a unit as of  the
immediately  preceding  Valuation  Period,  multiplied  by  the  "Net Investment
Factor"  for  that  Sub-Account  for  the  current  Valuation  Period.  The  Net
Investment Factor for each Sub-Account for any Valuation Period is determined by
dividing (A) by (B) and subtracting (C), where:
 
    (A) is the sum of:
 
        (1)  the net  asset value per  share of the  Portfolio(s) underlying the
    Sub-Account determined at the end of the current valuation period; plus,
 
        (2) the per share amount of  any dividend or capital gain  distributions
    made  by  the Portfolio(s)  underlying  the Sub-Account  during  the current
    Valuation Period.
 
    (B) is the  net asset  value per share  of the  Portfolio(s) underlying  the
Sub-Account  determined as  of the  end of  the immediately  preceding valuation
period.
 
    (C) is the annualized Mortality and Expense Risk and Administrative  Expense
Charges divided by 365 and then multiplied by the number of calendar days in the
current valuation period.
 
PERFORMANCE DATA
 
    From time to time the Variable Account May publish advertisements containing
performance  data relating  to its  Sub-Accounts. The  performance data  for the
Sub-Accounts (other  than  for the  Money  Market Sub-Account)  will  always  be
accompanied by total return quotations.
 
    A Sub-Account's "average annual total return" represents an annualization of
the  Sub-Account's  total return  over a  particular period  and is  computed by
finding the annual percentage  rate which will result  in the ending  redeemable
value  of a hypothetical $1,000 Purchase Payment made at the beginning of a one,
five or ten year period,  or for a period from  the date of commencement of  the
Sub-Account's  operations, if shorter than any of the foregoing. The formula for
computing the  average annual  total return  involves a  percentage obtained  by
dividing  the  ending  redeemable  value,  including  deductions  for  any Early
Withdrawal Charges or Contract Maintenance  Charges imposed on the Contracts  by
the  Variable  Account, by  the  initial hypothetical  $1,000  Purchase Payment,
taking the "n"th root of the quotient (where  "n" is the number of years in  the
period) and subtracting 1 from the result.
 
    The  Early  Withdrawal  Charges  assessed upon  redemption  are  computed as
follows: The Free Withdrawal Amount is not assessed an Early Withdrawal  Charge.
Early  Withdrawal Charges are charged  on the amount of  redemption equal to the
Purchase
 
                                       3
<PAGE>
Payment, reduced by the Free Withdrawal Amount, if any. The remaining amount  of
the  redemption, if any, is  not assessed an Early  Withdrawal Charge. The Early
Withdrawal Charge Schedule specifies rates based  on the Contract Year in  which
the  Purchase Payment was made. One rate is specified for Purchase Payments made
in the current  Contract Year, another  rate for Purchase  Payments made in  the
prior Contract Year, another rate for Purchase Payments made in the second prior
Contract  Year, and so on  until a rate for Purchase  Payments made in the sixth
prior Contract Year  or prior  to it  is reached. For  a one  year total  return
calculation  the second rate, (i.e., the rate  for Purchase Payments made in the
prior Contract  Year), is  assessed. The  Contract Maintenance  Charge ($30  per
contract)  used in the  total return calculation is  normally prorated using the
following method: The total amount of annual Contract fees collected during  the
year  is divided by  the total average  net assets of  all the Sub-Accounts. The
resulting percentage is then multiplied by the ending Cash Value.

STANDARDIZED TOTAL RETURN
- --------------------------------------------------------------------------------
 
    The standardized  average  annual  returns  for  the  Sub-Accounts  for  the
one-year,  five-year and  since inception periods  ending December  31, 1995 are
presented below:
 
                        (WITHOUT ENHANCED DEATH BENEFIT)
<TABLE>
<CAPTION>
SUB-ACCOUNT                 ONE-YEAR  FIVE-YEARS   SINCE INCEPTION*
- ------------------------------------- --------- --------------------
<S>                         <C>       <C>       <C>
Capital Growth..............   26.83%    N/A                  8.33%
Dividend Growth.............   30.25%    14.12%              15.80%
Equity......................   36.31%    19.17%              20.02%
European Growth.............   19.89%    N/A                 13.91%
Global Dividend Growth......   16.09%    N/A                  7.83%
High Yield..................    9.16%    19.48%              16.17%
Money Market................    N/A      N/A                   N/A
Pacific Growth..............    0.01%    N/A                 (4.52)%
Quality Income Plus.........   18.38%     9.32%               9.82%
Strategist..................    3.62%     9.88%              10.53%
Utilities...................   22.62%    11.28%              11.86%
 
           (WITH ENHANCED DEATH BENEFIT) (NOT ANNUALIZED)
 
<CAPTION>
 
SUB-ACCOUNT                                      SINCE INCEPTION**
- ----------------------------                    --------------------
<S>                         <C>       <C>       <C>
Capital Growth..............                                  2.21%
Dividend Growth.............                                  1.97%
Equity......................                                 (0.38)%
European Growth.............                                 (2.54)%
Global Dividend Growth......                                  0.90%
High Yield..................                                 (3.33)%
Money Market................                                   N/A
Pacific Growth..............                                 (2.33)%
Quality Income Plus.........                                 (1.21)%
Strategist..................                                 (2.58)%
Utilities...................                                  0.86%
</TABLE>
 
- --------------------------
 * The Money  Market,  Quality  Income Plus,  High  Yield,  Utilities,  Dividend
   Growth, Equity and Strategist Sub-Accounts commenced operation on October 25,
   1990. The Capital Growth and European Growth Sub-Accounts commenced operation
   on  March 1, 1991. The Global Dividend Growth and Pacific Growth Sub-Accounts
   commenced operation on February 23, 1994.
 
** The Sub-Accounts commenced operation on October 30, 1995.
 
    From time to time, sales literature or advertisements may also quote average
annual total  returns  for  periods  prior to  the  date  the  Variable  Account
commenced  operations. Such performance information for the Sub-Accounts will be
calculated based on the  performance of the Portfolios  and the assumption  that
the  Sub-accounts were in existence for the  same periods as those indicated for
the Portfolios, with the level of Contract charges currently in effect.
 
                                       4

<PAGE>
    Such average annual total return information for the Sub-Accounts (including
deduction of the Surrender Charge) is as follows:
 
                        (WITHOUT ENHANCED DEATH BENEFIT)
 
<TABLE>
<CAPTION>
SUB-ACCOUNT AND DATE                             10-YEARS OR
OF INCEPTION OF                              SINCE INCEPTION (IF
CORRESPONDING PORTFOLIO   1 YEAR    5-YEARS         LESS)
- ---------------------------------- --------- --------------------
<S>                      <C>       <C>       <C>
Capital Growth****.......   26.83%      N/A                8.33%
Dividend Growth***.......   30.25%    14.12%              10.22%
Equity*..................   36.31%    19.17%              11.96%
European Growth****......   19.89%      N/A               13.91%
Global Dividend
 Growth*****.............   16.09%      N/A                7.83%
High Yield*..............    9.16%    19.48%               6.35%
Money Market*............     N/A       N/A                 N/A
Pacific Growth*****......    0.01%      N/A               (4.52)%
Quality Income Plus**....   18.38%     9.32%               8.05%
Strategist**.............    3.62%     9.88%               7.92%
Utilities***.............   22.62%    11.28%              10.22%
</TABLE>
 
- --------------------------
    *Portfolio inception date of March 9, 1984
   **Portfolio inception date of March 1, 1987
  ***Portfolio inception date of March 1, 1990
 ****Portfolio inception date of March 1, 1991
*****Portfolio inception date of February 23, 1994
 
                         (WITH ENHANCED DEATH BENEFIT)
 
<TABLE>
<CAPTION>
SUB-ACCOUNT AND DATE
OF INCEPTION OF                               10-YEARS OR SINCE
CORRESPONDING PORTFOLIO   1 YEAR    5-YEARS  INCEPTION (IF LESS)
- ---------------------------------- --------- --------------------
<S>                      <C>       <C>       <C>
Capital Growth****.......   26.66%      N/A                8.18%
Dividend Growth***.......   30.07%    13.97%              10.07%
Equity*..................   36.13%    19.01%              11.82%
European Growth****......   19.73%      N/A               13.76%
Global Dividend
 Growth*****.............   15.94%      N/A                7.69%
High Yield*..............    9.01%    19.31%               6.21%
Money Market*............     N/A       N/A                 N/A
Pacific Growth*****......   (0.13)%      N/A              (4.65)%
Quality Income Plus**....   18.22%     9.18%               7.90%
Strategist**.............    3.48%     9.74%               7.77%
Utilities***.............   22.45%    11.14%              10.07%
</TABLE>
 
- --------------------------
    *Portfolio inception date of March 9, 1984
   **Portfolio inception date of March 1, 1987
  ***Portfolio inception date of March 1, 1990
 ****Portfolio inception date of March 1, 1991
*****Portfolio inception date of February 23, 1994
 
OTHER TOTAL RETURNS
 
    From time to time, sales literature or advertisements may also quote average
annual total  returns  that do  not  reflect  the Surrender  Charge.  These  are
calculated in exactly the same way as the average annual total returns described
above,  except that the ending redeemable  value of the hypothetical account for
the period is replaced with  an ending value for the  period that does not  take
into   account  any  charges   on  amounts  surrendered.   Sales  literature  or
advertisements may  also quote  such average  annual total  returns for  periods
prior to the date the Variable Account commenced operations, calculated based on
the  performance of the Portfolios and the assumption that the Sub-Accounts were
in existence for the  same periods as those  indicated for the Portfolios,  with
the  level  of Contract  charges currently  in effect  except for  the Surrender
Charge.
 
    Such average  annual  total return  information  for the  Sub-Accounts  (not
including deduction of the Surrender Charge) is as follows:
 
                        (WITHOUT ENHANCED DEATH BENEFIT)
 
<TABLE>
<CAPTION>
SUB-ACCOUNT AND DATE                                     10-YEARS OR
OF INCEPTION OF                                        SINCE INCEPTION
CORRESPONDING PORTFOLIO       1 YEAR       5-YEARS        (IF LESS)
- --------------------------  -----------  -----------  -----------------
<S>                         <C>          <C>          <C>
Capital Growth****........      31.14%         N/A            8.64%
Dividend Growth***........      34.56%       14.27%          10.35%
Equity*...................      40.63%       19.29%          12.01%
European Growth****.......      24.21%         N/A           14.17%
Global Dividend
 Growth*****..............      20.41%         N/A           10.04%
High Yield*...............      13.47%       19.60%           6.41%
Money Market*.............      N/A          N/A             N/A
Pacific Growth*****.......        4.32 %        N/A           (2.08)%
Quality Income Plus**.....       22.70 %       9.49 %          8.09 %
Strategist**..............        7.93 %      10.05 %          7.96 %
Utilities***..............       26.93 %      11.44 %         10.35 %
</TABLE>
 
- --------------------------
    *Portfolio inception date of March 9, 1984
   **Portfolio inception date of March 1, 1987
  ***Portfolio inception date of March 1, 1990
 ****Portfolio inception date of March 1, 1991
*****Portfolio inception date of February 23, 1994
 
                                       5

<PAGE>

                         (WITH ENHANCED DEATH BENEFIT)
 
<TABLE>
<CAPTION>
SUB-ACCOUNT AND DATE                                    10-YEARS OR
OF INCEPTION OF                                       SINCE INCEPTION
CORRESPONDING PORTFOLIO      1-YEAR       5-YEARS        (IF LESS)
- -------------------------  -----------  -----------  -----------------
<S>                        <C>          <C>          <C>
Capital Growth****.......      30.97%         N/A            8.49%
Dividend Growth***.......      34.39%       14.12%          10.21%
Equity*..................      40.45%       19.14%          11.86%
European Growth****......      24.05%         N/A           14.02%
Global Dividend
 Growth*****.............      20.25%         N/A            9.89%
High Yield*..............      13.33%       19.44%           6.27%
Money Market*............        N/A          N/A             N/A
Pacific Growth*****......       4.19%         N/A           (2.21)%
Quality Income Plus**....      22.54%        9.35%           7.95%
Strategist**.............       7.79%        9.90%           7.82%
Utilities***.............      26.77%       11.30%          10.21%
</TABLE>
 
- --------------------------
    *Portfolio inception date of March 9, 1984
   **Portfolio inception date of March 1, 1987
  ***Portfolio inception date of March 1, 1990
 ****Portfolio inception date of March 1, 1991
*****Portfolio inception date of February 23, 1994

    The Variable Account may also advertise the performance of the  Sub-Accounts
relative  to certain  performance rankings  and indexes  compiled by independent
organizations, such as: (a) Lipper Analytical Services, Inc.; (b) the Standard &
Poor's 500  Composite Stock  Price  Index ("S  & P  500");  and, (c)  A.M.  Best
Company.

 
TRANSFERS
 
    The  Owner may transfer  amounts from one  investment alternative to another
prior to  the  Payout  Start  Date.  Transfers  are  subject  to  the  following
restrictions:
 
        1.    The minimum  amount  that may  be  transferred from  an investment
    alternative is $100;  if the total  amount in an  investment alternative  is
    less than $100, the entire amount may be transferred.
 
        2.  The minimum transfer to any Guarantee Period of the Fixed Account is
    $500.
 
        3.   The maximum  amount in any  Contract Year which  may be transferred
    from the Fixed Account to the Variable Account or between Guarantee  Periods
    of  the Fixed Account is limited  to the greater of (1)  25% of the value in
    the Fixed Account as of the most recent Contract Anniversary; if 25% of  the
    value  as of the most  recent Contract Anniversary is  greater than zero but
    less than $1,000, then up  to $1,000 May be transferred;  or (2) 25% of  the
    sum  of all Purchase Payments  and transfers to the  Fixed Account as of the
    most recent Contract Anniversary.
 
        4.  If the  first renewal interest  rate is less  than the current  rate
    that  was in effect  at the time  money was allocated  or transferred to the
    Fixed  Account,  the  25%  transfer  restriction  for  that  money  and  the
    accumulated  interest  thereon  will  be waived  during  the  60  day period
    following the first renewal date.
 
    The Company reserves the right to assess transfer fees.
 
TAX-FREE EXCHANGES (1035 EXCHANGES,
ROLLOVERS AND TRANSFERS)
 
    The Company accepts Purchase Payments which  are the proceeds of a  Contract
in  a transaction qualifying for  a tax-free exchange under  Section 1035 of the
Internal Revenue Code.  Except as  required by  federal law  in calculating  the
basis  of the Contract, the Company  does not differentiate between Section 1035
Purchase Payments and non-Section 1035 Purchase Payments.
 
    The Company also accepts "rollovers" and transfers from Contracts qualifying
as tax-sheltered annuities (TSAs), individual retirement annuities or  accounts,
(IRAs),  or any other Qualified Contract which is eligible to "rollover" into an
IRA. The Company differentiates between Non-Qualified Contracts, TSAs, IRAs  and
other  Qualified Contracts  to the extent  necessary to comply  with federal tax
laws. For example, the Company restricts  the assignment, transfer or pledge  of
TSAs and IRAs so the
 
                                       6

<PAGE>
Contracts  will  continue  to  qualify  for  special  tax  treatment.  An  Owner
contemplating any  such exchange,  rollover  or transfer  of a  Contract  should
contact  a competent tax adviser with respect to the potential effects of such a
transaction.
 
GENERAL MATTERS
- --------------------------------------------------------------------------------
 
RECORDKEEPING SERVICES
 

    In 1993,  the Company  paid $336,207.59  to Vantage  for its  services  from
January 1, 1993 through October 3, 1993. The basis for the fee was an annual fee
of $16 per policy, plus out-of-pocket expenses for fees for enhancements.

 
    As  of  October 4,  1993, the  Company  performs all  Contract recordkeeping
services.
ADDITIONS, DELETIONS OR SUBSTITUTIONS OF INVESTMENTS
 
    The Company  retains the  right,  subject to  any  applicable law,  to  make
additions  to, deletions from or substitutions  for the Portfolio shares held by
any Sub-Account  of the  Variable Account.  The Company  reserves the  right  to
eliminate  the  shares of  any of  the  Portfolios and  to substitute  shares of
another Portfolio of  the Fund,  or of another  open-end, registered  investment
company,  if the shares of the Portfolio are no longer available for investment,
or if,  in the  Company's judgment,  investment in  any Portfolio  would  become
inappropriate  in view of the purposes of the Variable Account. Substitutions of
shares attributable to  an Owner's interest  in a Sub-Account  will not be  made
until  the Owner has been  notified of the change,  and until the Securities and
Exchange Commission has approved the change, to the extent such notification and
approval is required by the Investment Company Act of 1940. Nothing contained in
this Statement of Additional Information shall prevent the Variable Account from
purchasing other securities for  other series or classes  of contracts, or  from
effecting  a conversion between series  or classes of contracts  on the basis of
requests made by Owners.
 
    The Company  may  also establish  additional  Sub-Accounts of  the  Variable
Account. Each additional Sub-Account would purchase shares in a new Portfolio of
the Fund or in another mutual fund. New Sub-Accounts may be established when, in
the  sole discretion  of the Company,  marketing needs  or investment conditions
warrant. Any new  Sub-Accounts will be  made available to  existing Owners on  a
basis  to be determined  by the Company.  The Company may  also eliminate one or
more Sub-Accounts  if, in  its  sole discretion,  marketing, tax  or  investment
conditions so warrant.
 
    In  the  event of  any  such substitution  or  change, the  Company  may, by
appropriate endorsement, make such changes in  the Contract as may be  necessary
or  appropriate to reflect such  substitution or change. If  deemed to be in the
best interests of persons having voting rights under the policies, the  Variable
Account may be operated as a management company under the Investment Company Act
of  1940 or it may be deregistered under such Act in the event such registration
is no longer required.
 
REINVESTMENT
 
    All dividends  and  capital  gains distributions  from  the  Portfolios  are
automatically  reinvested in shares  of the distributing  Portfolio at their net
asset value.
 
INCONTESTABILITY
 
    The Contract will not be contested after it is issued.
 
SETTLEMENTS
 
    The Contract must be  returned to the Company  prior to any settlement.  Due
proof  of the Owner(s) or the Annuitant's (and any Joint Annuitant's) death must
be received prior to settlement of a death claim.
 
                                       7

<PAGE>
SAFEKEEPING OF THE VARIABLE ACCOUNT'S ASSETS
 
    The Company holds title  to the assets of  the Variable Account. The  assets
are  kept physically segregated  and held separate and  apart from the Company's
general  corporate  assets.  Records  are   maintained  of  all  purchases   and
redemptions of the Portfolio shares held by each of the Sub-Accounts.
 
    The   Dean  Witter  Variable  Investment  Series  ("Fund")  does  not  issue
certificates and,  therefore, the  Company holds  the Account's  assets in  open
account  in lieu  of stock  certificates. See the  Fund's Prospectus  for a more
complete description of the Fund's custodian.
 
EXPERTS
 

    The  financial  statements  of  the  Variable  Account  and  the   financial
statements  and financial  statement schedule of  the Company  appearing in this
Statement of Additional Information (which  is incorporated by reference in  the
prospectus  of  Northbrook  Variable  Annuity  Account  II  of  Northbrook  Life
Insurance Company) have been  audited by Deloitte &  Touche LLP, Two  Prudential
Plaza, 180 N. Stetson Avenue, Chicago, Illinois, independent auditors, as stated
in  their reports appearing herein and are included in reliance upon the reports
of such firm given upon their authority as experts in accounting and auditing.

 
LEGAL MATTERS
 

    Legal advice regarding  certain matters relating  to the federal  securities
laws  applicable to  the issue and  sale of  the Contracts has  been provided by
Routier and Johnson,  P.C., of  Washington, D.C..  All matters  of Illinois  law
pertaining  to the  Contracts, including the  validity of the  Contracts and the
Company's right to issue such Contracts under Illinois insurance law, have  been
passed  upon by Michael J. Velotta, General Counsel of Northbrook Life Insurance
Company.

 
FEDERAL TAX MATTERS
- --------------------------------------------------------------------------------
 
INTRODUCTION
 
    THE FOLLOWING DISCUSSION IS GENERAL AND  IS NOT INTENDED AS TAX ADVICE.  THE
COMPANY  MAKES  NO GUARANTEE  REGARDING  THE TAX  TREATMENT  OF ANY  CONTRACT OR
TRANSACTION  INVOLVING  A  CONTRACT.  Federal,   state,  local  and  other   tax
consequences  of ownership or receipt of distributions under an annuity contract
depend on the  individual circumstances  of each  person. If  you are  concerned
about  any tax  consequences with regard  to your  individual circumstances, you
should consult a competent tax adviser.
 
TAXATION OF NORTHBROOK LIFE INSURANCE
COMPANY
 
    The Company is taxed as a life insurance company under Part I of  Subchapter
L  of  the Internal  Revenue  Code. The  following  discussion assumes  that the
Company is taxed as a life insurance company under Part I of Subchapter L. Since
the Variable  Account  is not  an  entity separate  from  the Company,  and  its
operations  form a  part of the  Company, it will  not be taxed  separately as a
"regulated Investment Company" under Subchapter M of the Code. Investment income
and realized capital gains are automatically applied to increase reserves  under
the  contract. Under existing federal income  tax law, the Company believes that
the Variable Account investment income and  realized net capital gains will  not
be  taxed to the extent  that such income and gains  are applied to increase the
reserves under the contract.
 
    Accordingly, the Company does not anticipate that it will incur any  federal
income  tax liability  attributable to the  Variable Account,  and therefore the
Company does  not intend  to make  provisions for  any such  taxes. However,  if
changes in the federal tax laws or interpretations thereof result in the Company
being taxed on income or gains attributable to
 
                                       8

<PAGE>
the  Variable Account, then the Company may impose a charge against the Variable
Account (with respect to some or all contracts) in order to set aside provisions
to pay such taxes.
EXCEPTIONS TO THE NON-NATURAL OWNER RULE
 
    There are several exceptions  to the general rule  that contracts held by  a
non-natural  owner are not  treated as annuity contracts  for federal income tax
purposes. Contracts will generally be treated as held by a natural person if the
nominal owner is a trust or other entity which holds the contract as agent for a
natural person. However, this special exception will not apply in the case of an
employer who is the nominal owner  of an annuity contract under a  non-qualified
deferred  compensation arrangement  for its  employees. Other  exceptions to the
non-natural owner rule are: (1) contracts acquired by an estate of a decedent by
reason of  the death  of  the decedent;  (2)  certain qualified  contracts;  (3)
contracts  purchased  by employers  upon  the termination  of  certain qualified
plans; (4)  certain  contracts used  in  connection with  structured  settlement
agreements,  and (5) contracts purchased with  a single premium when the annuity
starting date  is  no  later than  a  year  from purchase  of  the  annuity  and
substantially  equal  periodic  payments  are  made,  not  less  frequently than
annually, during the annuity period.
 
PENALTY TAX ON PREMATURE DISTRIBUTIONS
 
    There is a 10%  penalty tax on  the taxable amount  of any payment  received
from  a non-qualified annuity contract unless:  (1) made after the owner reaches
59 1/2;  (2)  attributable  to  the  owner's  disability;  (3)  attributable  to
investment  before August  14, 1982, including  earnings on  pre-August 14, 1982
investment; (4) made from certain qualified contracts; (5) made after the  death
of  the owner; (6)  made under an  immediate annuity contract;  (7) made from an
annuity purchased and held  by an employer upon  the termination of a  qualified
retirement plan; (8) made under a qualified funding asset; (9) made as part of a
series  of  substantially  equal  periodic payments  (not  less  frequently than
annually) for the life of or life expectancy of the owner or the joint lives  of
joint  life expectancies of the owner  and designated beneficiary. Similar rules
apply in the case of qualified contracts.
 
IRS REQUIRED DISTRIBUTION AT DEATH RULES
 
    In order  to  be considered  an  annuity  contract for  federal  income  tax
purposes,  an annuity contract must  provide: (1) if any  owner dies on or after
the annuity start date but before the  entire interest in the contract has  been
distributed, the remaining portion of such interest must be distributed at least
as  rapidly as under the method of distribution being used as of the date of the
owner's death; (2) if any owner dies prior to the annuity start date, the entire
interest in the contract will be distributed within five years after the date of
the owner's  death. These  requirements  are satisfied  if  any portion  of  the
owner's  interest  which is  payable to  (or  for the  benefit of)  a designated
beneficiary is distributed over the life  of such beneficiary (or over a  period
not   extending  beyond  the  life  expectancy   of  the  beneficiary)  and  the
distributions begin  within  one year  of  the  owner's death.  If  the  owner's
designated beneficiary is the surviving spouse of the owner, the contract may be
continued  with  the surviving  spouse as  the new  owner. If  the owner  of the
contract is a  non-natural person,  then the annuitant  will be  treated as  the
owner  for purposes of applying the distribution  at death rules. In addition, a
change in the  annuitant on a  contract owned  by a non-natural  person will  be
treated as the death of the owner.
 
QUALIFIED PLANS
 
    This annuity contract may be used with several types of qualified plans. The
tax  rules applicable to participants in  such qualified plans vary according to
the type of plan and  the terms and conditions of  the plan itself. Adverse  tax
consequences  may  result  from excess  contributions,  premature distributions,
distributions  that  do  not  conform  to  specified  commencement  and  minimum
distribution  rules, excess distributions and in other circumstances. Owners and
participants under the plan and annuitants and beneficiaries under the  contract
may be subject to
 
                                       9

<PAGE>

the terms and conditions of the plan regardless of the terms of the contract.
 
TYPES OF QUALIFIED PLANS
 
INDIVIDUAL RETIREMENT ANNUITIES
 
    Section  408 of  the Code permits  eligible individuals to  contribute to an
individual  retirement  program  known  as  an  Individual  Retirement  Annuity.
Individual  Retirement Annuities are  subject to limitations  on the amount that
can be contributed  and on  the time  when distributions  may commence.  Certain
distributions  from other  types of  qualified plans may  be "rolled  over" on a
tax-deferred basis into an Individual Retirement Annuity.
 
SIMPLIFIED EMPLOYEE PENSION PLANS
 
    Section 408(k) of the Code allows employers to establish simplified employee
pension plans for  their employees  using the  employees' individual  retirement
annuities  if  certain criteria  are met.  Under these  plans the  employer may,
within  specified  limits,  make  deductible  contributions  on  behalf  of  the
employees to their individual retirement annuities.

   
SAVINGS INCENTIVE MATCH PLANS FOR EMPLOYEES (SIMPLE PLANS)

    Sections 408(p) and 401(k) of the Code allow employers with 100 or fewer 
employees to establish SIMPLE retirement plans for their employees. SIMPLE 
plans may be structured as a SIMPLE retirement account using an employee's 
IRA to hold the assets or as a Section 401(k) qualified cash or deferred 
arrangement. In general, a SIMPLE plan consists of a salary deferral program 
for eligible employees and matching or nonelective contributions made by 
employers. Employers intending to use the contract in conjunction with SIMPLE 
plans should seek competent tax and legal advice.
    

TAX SHELTERED ANNUITIES
 
    Section  403(b) of the Code permits public school employees and employees of
certain types of tax-exempt organizations (specified in Section 501(c)(3) of the
Code) to have their employers purchase  annuity contracts for them, and  subject
to  certain limitations,  to exclude the  purchase payments  from the employees'
gross income. An annuity  contract used for a  Section 403(b) plan must  provide
that  distributions attributable  to salary  reduction contributions  made after
12/31/88, and all earnings on salary  reduction contributions, may be made  only
after  the employee  attains age 59  1/2, separates from  service, dies, becomes
disabled or in the case of hardship (earnings on salary reduction  contributions
may not be distributed for hardship).
 
CORPORATE AND SELF-EMPLOYED PENSION AND PROFIT SHARING PLANS
 
    Sections  401(a)  and  403(a)  of the  Code  permit  corporate  employers to
establish various  types of  tax  favored retirement  plans for  employees.  The
Self-Employed Individuals Retirement Act of 1962, as amended, (commonly referred
to  as "H.R. 10" or "Keogh")  permits self-employed individuals to establish tax
favored retirement plans  for themselves  and their  employees. Such  retirement
plans  may permit the purchase of annuity contracts in order to provide benefits
under the plans.
 
STATE AND LOCAL GOVERNMENT AND TAX-EXEMPT ORGANIZATION DEFERRED COMPENSATION
PLANS
 
    Section 457 of the Code permits employees of state and local governments and
tax-exempt organizations to defer a portion of their compensation without paying
current taxes.  The  employees must  be  participants in  an  eligible  deferred
compensation  plan. Generally, under the non-natural owner rules, such contracts
are not treated as annuity contracts for federal income tax purposes.
 
VOTING RIGHTS
- --------------------------------------------------------------------------------
 
    The number  of votes  which  a person  has the  right  to instruct  will  be
calculated  separately for each  Sub-Account. That number  will be determined by
applying his/her percentage interest, if any, in a particular Sub-Account to the
total number of votes attributable to the Sub-Account.
 
    The number of votes of the Portfolio which an Owner has a right to  instruct
will  be determined as of the date  coincident with the date established by that
Portfolio for determining shareholders  eligible to vote at  the meeting of  the
Fund.  Voting instructions will  be solicited by  written communication prior to
such meeting in accordance with procedures established by the Fund.
 
    Fund shares as to which no timely instructions are received will be voted in
proportion to the  voting instructions which  are received with  respect to  all
Contracts participating in that Sub-Account. Voting
 
                                    10

<PAGE>
instructions  to abstain on any item  to be voted upon will  be applied on a pro
rata basis to reduce the votes eligible to be cast.
 
    Each person having  a voting interest  in a Sub-Account  will receive  proxy
material, reports and other materials relating to the appropriate Portfolio.
 
SALES COMMISSIONS
- --------------------------------------------------------------------------------
 
    The  Company  pays  Dean Witter  for  its underwriting  and  general agent's
services a sales commission  of up to  6.0% of the  Purchase Payments and  sales
administration  expense allowance of up  to 0.125% of the  average net assets of
the Fixed  Account.  These  commissions  are intended  to  cover  Dean  Witter's
expenses  in distributing  and selling the  Contracts. In addition,  sale of the
Contract  may  count  toward  incentive   program  awards  for  the   Registered
Representative.
 

    In  accordance with the Underwriting  and General Agent's Agreements between
Dean Witter  and  the  Company,  Dean  Witter offers  for  sale  and  sells  the
Contracts,  prepares sales or promotional  literature and prints and distributes
the Prospectuses to prospective purchasers.  The Company paid Dean Witter  sales
commission  in  the  amount of  $32,937,708  in  1995, $42,196,817  in  1994 and
$65,164,096 in 1993  for its  services under  these agreements.  These fees  are
based on sales commissions.

 
    Under  the  Underwriting Agreement  and  Managing General  Agent's Agreement
between Dean Witter and the Company, Dean Witter is responsible for paying costs
and expenses associated with licensing  its agents, paying agent's  commissions,
printing, mailing and distributing the Prospectus to prospective purchasers; and
preparing,  printing  and  distributing  sales  literature.  In  the  event  the
commissions fail to adequately compensate  Dean Witter for these expenses,  Dean
Witter will pay these expenses from its own funds.
 
                                       11
<PAGE>

                                     PART C
                               OTHER INFORMATION

24A. FINANCIAL STATEMENTS
 
   
     Northbrook Life Insurance Company
     Financial Statements and Financial Schedules will be included in a
       subsequent Post-Effective amendment.
    

24B. EXHIBITS
 

    The following exhibits, correspond to those required by paragraph (b) of 
item 24 as to exhibits in Form N-4:






   
<TABLE>
<S>        <C>
 (1)       Resolution of the Board of Directors of Northbrook Life Insurance Company authorizing
           establishment of the Variable Annuity Account II*
 (2)       Not Applicable
 (3)(a)    Underwriting Agreement*
   (b)     Form of General Agency Agreement*
 (4)       Form of Contract and Certificate Amendments*,**
 (5)       Form of application for a Contract*
 (6)(a)    Articles of Incorporation of Northbrook Life Insurance Company*
   (b)     By-laws of Northbrook Life Insurance Company*
 (7)       Not applicable
 (8)       Participation Agreement***
 (9)       Opinion of Robert S. Seiler, Senior Vice President, Secretary and General Counsel of
           Northbrook Life Insurance Company*
(10)(a)    Consent of Accountants****
   (b)     Consent of Attorneys*****
(11)       Not applicable
(12)       Form of Agreement to Purchase Shares*
(13)       Performance Data Calculations****
(99)       Powers of Attorney*
</TABLE>
    
 
- ------------------------

   
*       Previously filed in Form N-4 Registration Statement No. 33-35412 dated
        December 31, 1996.

**      Filed herewith.

***     Previously filed in Form N-4 Registration Statement No. 33-35412 dated 
        April 30, 1996 and incorporated by reference.

****    To be filed by Subsequent Post-Effective Amendment.

*****   Previously filed in Form N-4 Registration Statement No. 33-35412 dated
        June 14, 1990 and incorporated by reference.

    
<PAGE>
25.  DIRECTORS AND OFFICERS OF THE DEPOSITOR
 
   
<TABLE>
<CAPTION>
  NAME AND PRINCIPAL BUSINESS
            ADDRESS                       POSITION AND OFFICE WITH DEPOSITOR OF THE TRUST
- -------------------------------  ------------------------------------------------------------------
<S>                              <C>
Louis G. Lower, II               Chairman of the Board of Directors and Chief Executive Officer
Michael J. Velotta               Director, Vice President, Secretary and General Counsel
Peter H. Heckman                 Director, President and Chief Operating Officer
Marla G. Friedman                Vice President
John R. Hunter                   Director and Assistant Vice President
Kevin R. Slawin                  Director and Vice President
Casey J. Sylla                   Director and Chief Investment Officer
Karen C. Gardner                 Vice President
James P. Zils                    Treasurer
Keith A. Hauschildt              Assistant Vice President and Controller
Sarah R. Donahue                 Assistant Vice President
Ronald Johnson                   Assistant Vice President
Barry S. Paul                    Assistant Vice President
Emma M. Kalaidjian               Assistant Secretary
Paul N. Kierig                   Assistant Secretary
Mary J. McGinn                   Assistant Secretary
Robert N. Roeters                Assistant Vice President
Theodore A. Schnell              Assistant Vice President, Assistant Secretary and Assistant
                                  Treasurer
Brenda D. Sneed                  Assistant Secretary and Assistant General Counsel
C. Nelson Strom                  Assistant Vice President and Corporate Actuary
Charles F. Thalheimer            Assistant Vice President
Steven E. Shebik                 Assistant Treasurer
</TABLE>
    
 
    The principal business address  of the foregoing  officers and directors  is
3100 Sanders Road, Northbrook, Illinois 60062.
 
26.  PERSONS CONTROLLED BY OR UNDER COMMON CONTROL WITH DEPOSITOR OR REGISTRANT
 
    See 10-K Commission File #1-11840, The Allstate Corporation.
 
27.  NUMBER OF CONTRACT OWNERS
 
   
    As  of December 31, 1996 there were in force 10,381 qualified  and 64,051
non-qualified contracts. The Registrant began operations on October 25, 1990.
    
 
28.  INDEMNIFICATION
 
    The Managing General  Agent's Agreement  (Exhibit 3(b)) has  a provision  in
which  Northbrook Life agrees  to indemnify Dean  Witter Reynolds as Underwriter
for certain damages and  expenses that may be  caused by actions, statements  or
omissions  by  Northbrook  Life. The  Agreement  to Purchase  Shares  contains a
similar provision in paragraph 16 of Exhibit 12.
 
    Insofar as indemnification for liability  arising out of the Securities  Act
of  1933 may be permitted to directors,  officers and controlling persons of the
registrant pursuant to  the foregoing provisions,  or otherwise, the  registrant
has  been advised that in the opinion  of the Securities and Exchange Commission
such indemnification is against  public policy as expressed  in the Act and  is,
therefore,  unenforceable.  In  the  event  that  a  claim  for  indemnification
<PAGE>
against such  liabilities (other  than  payment by  the registrant  of  expenses
incurred  by a director, officer or controlling  person of the registrant in the
successful defense  of  any  action,  suit,  or  proceeding)  is  asserted  such
director,  officer or controlling person in connection with the securities being
registered, the registrant will, unless in the opinion of its counsel the matter
has been settled  by controlling  precedent, submit  to a  court of  appropriate
jurisdiction  the question whether such indemnification  by it is against public
policy as expressed in the Act and will be governed by the final adjudication of
such issue.
 
29A.  RELATIONSHIP OF PRINCIPAL UNDERWRITER TO OTHER INVESTMENT COMPANIES
 
    Dean Witter Distributors Inc. is the principal underwriter for the following
investment companies:
 

Dean Witter Liquid Asset Fund Inc.

Dean Witter Tax-Free Daily Income Trust

Dean Witter California Tax-Free Daily Income Trust

Dean Witter Retirement Series

Dean Witter Dividend Growth Securities Inc.

Dean Witter Natural Resource Development
 Securities Inc.

Dean Witter World Wide Investment Trust

Dean Witter Capital Growth Securities

Dean Witter Convertible Securities Trust

Active Assets Tax-Free Trust

Active Assets Money Trust

Active Assets California Tax-Free Trust

Active Assets Government Securities Trust

Dean Witter Short-Term Bond Fund

Dean Witter Mid-Cap Growth Fund

Dean Witter U.S. Government Securities Trust

Dean Witter High Yield Securities Inc.

Dean Witter New York Tax-Free Income Fund

Dean Witter Tax-Exempt Securities Trust

Dean Witter California Tax-Free Income Fund


Dean Witter Limited Term Municipal Trust


Dean Witter World Wide Income Trust

Dean Witter Utilities Fund

Dean Witter Strategist Fund

Dean Witter New York Municipal Money
 Market Trust

Dean Witter Intermediate Income Securities

Prime Income Trust

Dean Witter European Growth Fund Inc.

Dean Witter Developing Growth Securities Trust

Dean Witter Precious Metals and Minerals Trust

Dean Witter Pacific Growth Fund Inc.

Dean Witter Multi-State Municipal Series Trust

Dean Witter Federal Securities Trust

Dean Witter Short-Term U.S. Treasury Trust

Dean Witter Diversified Income Trust

Dean Witter Health Sciences Trust

Dean Witter Global Dividend Growth Securities

Dean Witter American Value Fund

Dean Witter U.S. Government Money Market Trust

Dean Witter Global Short-Term Income Fund Inc.

Dean Witter Premier Income Trust

Dean Witter Value-Added Market Series

Dean Witter Global Utilities Fund

Dean Witter High Income Securities

Dean Witter National Municipal Trust

Dean Witter International SmallCap Fund

Dean Witter Global Asset Allocation 

Dean Witter Balanced Income Fund

Dean Witter Balanced Growth Fund

Dean Witter Hawaii Municipal Trust

Dean Witter Capital Appreciation Fund

Dean Witter Intermediate Term U.S. Treasury Trust

Dean Witter Information Fund

Dean Witter Japan Fund

Dean Witter Income Builder Fund
Dean Witter Special Value Fund

TCW/DW Core Equity Trust

TCW/DW North American Government
 Income Trust

TCW/DW Latin American Growth Fund

TCW/DW Income and Growth Fund


TCW/DW Small Cap Growth Fund

TCW/DW Balanced Fund

TCW/DW Mid-Cap Equity Trust

TCW/DW Total Return Trust

TCW/DW Global Telecom Trust
TCW/DW Strategic Income Trust


<PAGE>
29B.  PRINCIPAL UNDERWRITER
 

<TABLE>
<CAPTION>
  NAME AND PRINCIPAL BUSINESS
  ADDRESS OF EACH SUCH PERSON                  POSITIONS AND OFFICES WITH UNDERWRITER
- -------------------------------  ------------------------------------------------------------------
<S>                              <C>
Dean   Witter   Reynolds   Inc.  Underwriter
("Dean Witter")
Philip J. Purcell                Chairman, Chief Executive Officer and Director
Richard M. Demartini             President, Chief Operating Officer and Director, Dean Witter
                                  Capital
James F. Higgins                 President and Chief Operating Officer and Director, Dean Witter
                                  Financial
Stephen R. Miller                Senior Executive Vice President and Director
Raymond J. Drop                  Executive Vice President
Robert J. Dwyer                  Executive Vice President, National Sales Director and Director
Christine A. Edwards             Executive Vice President, Secretary, General Counsel and Director
Charles A. Fiumefreddo           Executive Vice President and Director
Frederick J. Frohne              Executive Vice President
Alfred J. Golden                 Executive Vice President
E. Davisson Hardman              Executive Vice President
Mitchell M. Merin                Executive Vice President, Chief Administrative Officer and
                                  Director
Laurence E. Mollner              Executive Vice President
Jeremiah A. Mullins              Executive Vice President
Richard F. Powers                Executive Vice President and Director
John H. Schaefer                 Executive Vice President
Thomas C. Schneider              Executive Vice President, Chief Financial Officer and Director
Robert B. Sculthorpe             Executive Vice President
William B. Smith                 Executive Vice President and Director
Samule H. Wolcott, III           Executive Vice President
Anthony Basile                   Senior Vice President
Ronald T. Carman                 Senior Vice President, Associate General Counsel and Assistant
                                  Secretary
Michael T. Cunningham            Senior Vice President
Mary E. Curran                   Senior Vice President
Raymond F. Douglas               Senior Vice President
Paul J. Dubow                    Senior Vice President and Deputy General Counsel
Michael T. Gregg                 Senior Vice President and Deputy General Counsel
Erick R. Holt                    Senior Vice President and Assistant Secretary
Birendra Kumar                   Senior Vice President and Treasurer
George R. Ross                   Senior Vice President
Robert P. Seass                  Senior Vice President
Joseph G. Siniscalchi            Senior Vice President and Controller, Dean Witter Financial
Michael H. Stone                 Senior Vice President
</TABLE>

<PAGE>

<TABLE>
<CAPTION>
  NAME AND PRINCIPAL BUSINESS
  ADDRESS OF EACH SUCH PERSON                  POSITIONS AND OFFICES WITH UNDERWRITER
- -------------------------------  ------------------------------------------------------------------
Lawrence Volpe                   Senior Vice President and Controller, Dean Witter Reynolds Inc.
                                  and Dean Witter Capital
<S>                              <C>
Lorena J. Kern                   Senior Vice President
Kathryn M. McNamara              Senior Vice President and Director of Governmental Affairs
Michael D. Browne                Assistant Secretary
Marilyn Cranney                  Assistant Secretary
Sheldon Curtis                   Assistant Secretary
Sabrina Hurley                   Assistant Secretary
Linda M. Butler                  Assistant Secretary
</TABLE>

 

    The  principal address of Dean  Witter is Two World  Trade Center, New York,
New York 10048.

 
29C.  COMPENSATION OF DEAN WITTER
 
    The following  commissions  and other  compensation  were received  by  each
principal  underwriter, directly or  indirectly, from the  Registrant during the
Registrant's last fiscal year:
 
   
<TABLE>
<CAPTION>
      (1)             (2)            (3)             (4)             (5)
                      NET        COMPENSATION
                 UNDERWRITING   OR REDEMPTION
    NAME OF      DISCOUNTS AND        OR          BROKERAGE
   PRINCIPAL      COMMISSIONS   ANNUITIZATION    COMMISSIONS     COMPENSATION
- ---------------  -------------  --------------  --------------  --------------
<S>              <C>            <C>             <C>             <C>
Dean Witter
Reynolds Inc.                                   $53,617,941
</TABLE>
    
 
30.  LOCATION OF ACCOUNTS AND RECORDS
 
    Michael J. Velotta
    Northbrook Life Insurance Company
    3100 Sanders Road
    Northbrook, Illinois 60062
 
31.  MANAGEMENT SERVICES
 
    None
<PAGE>
32.  UNDERTAKINGS
 
    The  Registrant  promises  to  file  a  post-effective  amendment  to   this
Registration  Statement as frequently as is necessary to ensure that the audited
financial statements in the Registration Statement are never more than 16 months
old for  so  long  as payments  under  the  variable annuity  contracts  may  be
accepted.  Registrant  furthermore  agrees  to include  either  as  part  of any
application to purchase a  contract offered by the  prospectus, a space that  an
applicant  can check to request a Statement  of Additional Information or a post
card or similar written communication affixed  to or included in the  Prospectus
that the applicant can remove to send for a Statement of Additional Information.
Finally,   the  Registrant  agrees  to   deliver  any  Statement  of  Additional
Information and any  Financial Statements  required to be  made available  under
this Form N-4 promptly upon written or oral request.
 
33.  REPRESENTATIONS PURSUANT TO SECTION 403(B) OF THE INTERNAL REVENUE CODE
 
    The  Company  represents  that  it  is  relying  upon  a  November  28, 1988
Securities and  Exchange  Commission no-action  letter  issued to  the  American
Council  of Life Insurance ("ACLI") and that the provisions of paragraphs 1-4 of
the no-action letter have been complied with.


34.  REPRESENTATION REGARDING CONTRACT EXPENSES

    Northbrook Life Insurance Company ("Northbrook Life") represents that the 
fees and charges deducted under the Group and Individual Variable Annuity 
Contracts hereby registered by this Registration Statement, in aggregate, are 
reasonable in relation to the services rendered, the expenses expected to be 
incurred, and the risks assumed by Northbrook Life.


<PAGE>

                                 SIGNATURES
   
  Pursuant to the requirements of the Securities Act of 1933 and the 
Investment Company Act of 1940, the registrant, Northbrook Variable Annuity 
Account II, has duly caused this Registration Statement to be signed on its 
behalf by the undersigned, thereunto duly authorized, and its seal to be 
hereunto affixed and attested, all in the Township of Northfield, State of 
Illinois, on the 26 day of February, 1997.
    
    NORTHBROOK VARIABLE ANNUITY ACCOUNT II
                       (REGISTRANT)

                            BY: NORTHBROOK LIFE INSURANCE COMPANY
                                      (DEPOSITOR)


(SEAL)
Attest: /s/BRENDA D. SNEED                By: /s/MICHAEL J. VELOTTA
        ------------------                    ---------------------
        Brenda D. Sneed                    Michael J. Velotta
        Assistant Secretary                Vice President, Secretary and
         And Assistant General Counsel         General Counsel
   
  Pursuant to the requirements of the Securities Act of 1933 and the Investment
Company Act of 1940, this Registration Statement has been duly signed below by
the following Directors and Officers of Northbrook Life Insurance Company on the
26 day of February, 1997.
    

*/LOUIS G. LOWER, II        Chairman of the Board of Directors and
- ----------------------       Chief Executive Officer
   Louis G. Lower, II        (Principal Executive Officer)

/s/MICHAEL J. VELOTTA       Vice President, Secretary, General
- ----------------------       Counsel and Director
   Michael J. Velotta      
   
*/PETER H. HECKMAN          President, Chief Operating Officer
- ----------------------       and Director
   Peter H. Heckman          
    
*/JOHN R. HUNTER            Assistant Vice President
- ----------------------       and Director
   John R. Hunter          
   
*/KEVIN R. SLAWIN           Vice President and Director
- ----------------------        (Principal Financial Officer)
  Kevin R. Slawin
    
*/CASEY J. SYLLA            Chief Investment Officer and Director
- ----------------------
  Casey J. Sylla
   
*/MARLA G. FRIEDMAN         Vice President
- ----------------------
 Marla G. Friedman
    
   
*/KAREN C. GARDNER          Vice President
- ----------------------
  Karen C. Gardner
    
*/JAMES P. ZILS             Treasurer
- ----------------------
   James P. Zils
   
*/KEITH A. HAUSCHILDT       Assistant Vice President and Controller
- ----------------------       (Principal Accounting Officer)
   Keith A. Hauschildt
    

*/ By Michael J. Velotta, pursuant to Power of Attorney, previously filed.
   
    


<PAGE>


                        NORTHBROOK LIFE INSURANCE COMPANY
                          (herein called "we" or "us")

                         PERFORMANCE DEATH BENEFIT RIDER

This rider was issued because you selected the Performance Death Benefit for the
death of any owner at the time you applied for this annuity.  Unlike your
current DEATH BENEFIT GUARANTEE, the Performance Death Benefit applies to the
death of the annuitant only if the owner is a non-natural person.

I.   The Death Benefit provision of your Contract is modified as follows:

     The Death Benefit will be the greatest of the values stated in your
     Contract, or the value of the Performance Death Benefit.

     On the date of issue, the Performance Death Benefit is equal to the initial
     purchase payment.

     After issue, the Performance Death Benefit is recalculated when a purchase
     payment or withdrawal is made or on a contract anniversary as follows:

     A.   For purchase payments, the Performance Death Benefit is equal to the
          most recently calculated Performance Death Benefit plus the purchase
          payment.

     B.   For withdrawals, the Performance Death Benefit is equal to the most
          recently calculated Performance Death Benefit reduced by a withdrawal
          adjustment.

          The adjustment is equal to (1) divided by (2), with the result
          multiplied by (3), where:

          (1)  =  the withdrawal amount.
          (2)  =  the accumulation value immediately prior to the withdrawal.
          (3)  =  the most recently calculated Performance Death Benefit.

     C.   On each contract anniversary, the Performance Death Benefit is equal
          to the greater of the accumulation value or the most recently
          calculated Performance Death Benefit.

     In the absence of any withdrawals or purchase payments, the Performance
     Death Benefit will be the greatest of all contract anniversary accumulation
     values on or prior to the date we calculate the death benefit.

     The Performance Death Benefit will be recalculated until the oldest owner
     or the annuitant, if the owner is a non-natural person, attains age 85.
     The Performance Death Benefit will never be greater than the maximum death
     benefit allowed by any non-forfeiture laws which govern this
     Contract.

II.  The Mortality and Expense Risk Charge provision of your Contract is
     modified as follows:

     The annualized mortality and expense risk charge of 1.25% is changed to
     1.38%.

Except as amended, the Contract remains unchanged.


       /s/ Michael J. Velotta               /s/ Louis G. Lower, II

       Michael J. Velotta                      Louis G. Lower, II
            Secretary                       Chief Executive Officer
<PAGE>

                        NORTHBROOK LIFE INSURANCE COMPANY
                          (herein called "we" or "us")

                             Amendatory Endorsement


The following provisions amend your Contract and will take precedence over any
other provisions to the contrary in your Contract.

I.   The following provision is added to the Accumulation Phase section of your
     Contract:

     DOLLAR COST AVERAGING FIXED ACCOUNT  Money in the Dollar Cost Averaging
     Fixed Account will earn interest at the current rate in effect at the time
     of allocation to the Dollar Cost Averaging Fixed Account for a period of
     one year.  After the first year, a renewal rate will be declared.  The
     current rate and the renewal rate(s) will never be less than 3%.
     Subsequent renewal dates will be on anniversaries of the first renewal
     date.

     Interest is credited to the Dollar Cost Averaging Fixed Account daily
     during the accumulation phase.  The rates we quote when referring to
     interest credits are effective annual interest rates as defined in the
     Fixed Account provision of your Contract.

     Transfers are not allowed into the Dollar Cost Averaging Fixed Account.

II.  The Transfers provision in the Accumulation Phase section of your Contract
     is deleted and replaced with the following:

     TRANSFERS  Prior to the payout start date, you may transfer amounts between
     investment alternatives.  You may make 12 transfers per contract year
     without charge.  Each transfer after the 12th transfer in any contract
     year, except those from the Dollar Cost Averaging Fixed Account, will be
     assessed a $25 transfer fee.  Transfers are subject to the following
     restrictions:

     -    The minimum amount that may be transferred from an investment
          alternative is $100; if the total amount in an investment alternative
          is less than $100, the entire amount may be transferred.

     -    The minimum transfer to any one guarantee period of the fixed account
          is $500.  No transfers are allowed into the Dollar Cost Averaging
          Fixed Account.

     -    The following limits do not apply to transfers from the Dollar Cost
          Averaging Fixed Account.  The maximum amount which may be transferred
          from the fixed account to the variable account or between guarantee
          periods of the fixed account in any contract year is limited to the
          greater of:

          -    25% of the value in the fixed account on the most recent contract
               anniversary.  If 25% of the most recent value is greater than
               zero but less than $1,000, then up to $1,000 may be transferred;
               or

          -    25% of the sum of purchase payments allocated to the fixed
               account and transfers to the fixed account, all as of the most
               recent contract anniversary.

          If the first renewal interest rate is less than the current rate that
          was in effect at the time money was allocated or transferred to the
          fixed account, the 25% transfer restriction for that money and the
          accumulated interest thereon will be waived during the 60 day period
          following the first renewal date.


                                     Page 1
<PAGE>

     We reserve the right to waive the transfer restrictions contained in your
     Contract.

III. The Payout Start Date provision in the Payout Phase section of your
     Contract is deleted and replaced with the following:

     PAYOUT START DATE  The anticipated payout start date is shown on the
     Annuity Data Page.  You may change the payout start date by writing to us
     at least 30 days prior to the payout start date.

     The latest payout start date is the later of:

     -    the annuitant's 90th birthday; or

     -    the 10th anniversary of your Contract's issue date.

     Unless changed as described above, we will use the payout start date shown
     on the Annuity Data Page.

IV.  The following is added to the Death of Owner or Annuitant provision in the
     Accumulation Phase section of your Contract:

     If the surviving spouse of the deceased owner is the new owner, then the
     spouse may elect one of the income plans described in the Income Payments
     provision of your Contract or may continue your Contract in the
     Accumulation Phase as if the death had not occurred.  If your Contract is
     continued in the Accumulation Phase, the surviving spouse may make a single
     withdrawal of any amount within one year of the date of death without
     incurring a Withdrawal Charge.


Except as amended, your Contract remains unchanged.



       /s/ Michael J. Velotta               /s/ Louis G. Lower, II

       Michael J. Velotta                      Louis G. Lower, II
            Secretary                       Chief Executive Officer




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