AMERICAN FINANCIAL GROUP INC
424B5, 1997-12-11
FIRE, MARINE & CASUALTY INSURANCE
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<PAGE>   1
 
          PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED DECEMBER 10, 1997
 
                                  $100,000,000
 
                         AMERICAN FINANCIAL GROUP, INC.
                       7 1/8% Senior Debentures Due 2007
                               ------------------
 
Interest payable June 15 and December 15                   Due December 15, 2007
 
    American Financial Group, Inc. ("AFG" or the "Company") is offering (the
"Offering") $100,000,000 aggregate principal amount of 7 1/8% Senior Debentures
due 2007 (the "Senior Debentures"). The Senior Debentures will be redeemable at
any time at the option of the Company, in whole or in part, at a price equal to
  the sum of (i) the principal amount of Senior Debentures being redeemed plus
   accrued interest to the redemption date and (ii) the Make-Whole Amount (as
   defined herein), if any. The Senior Debentures will not be subject to any
                                 sinking fund.
 
 The Senior Debentures will be general unsecured obligations of the Company and
  will rank pari passu with other senior unsecured indebtedness of the Company
    (none at September 30, 1997). The Senior Debentures will be structurally
     subordinated to all indebtedness of the Company's subsidiaries, which
     indebtedness totaled approximately $390 million at September 30, 1997.
                               ------------------
 
  SEE "RISK FACTORS" BEGINNING ON PAGE S-5 FOR A DISCUSSION OF CERTAIN FACTORS
 WHICH SHOULD BE CONSIDERED BY PROSPECTIVE PURCHASERS OF THE SENIOR DEBENTURES.
 
                               ------------------
 
  THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
 EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE SECURITIES
   AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON THE
   ACCURACY OR ADEQUACY OF THIS PROSPECTUS SUPPLEMENT OR THE PROSPECTUS. ANY
             REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
 
<TABLE>
<CAPTION>
                                                                  UNDERWRITING
                                                  PRICE TO        DISCOUNTS AND      PROCEEDS TO
                                                   PUBLIC          COMMISSIONS       COMPANY (1)
                                                -------------     -------------     -------------
<S>                                             <C>               <C>               <C>
Per Senior Debenture.........................      99.816%           0.650%            99.166%
Total........................................    $99,816,000        $650,000         $99,166,000
</TABLE>
 
(1) Before deducting expenses of the Company estimated at $275,000.
 
     The Senior Debentures are offered by the several Underwriters when, as and
if issued by the Company, delivered to and accepted by the Underwriters and
subject to their right to reject orders in whole or in part. It is expected that
the Senior Debentures will be ready for delivery in book entry form through the
facilities of The Depository Trust Company on or about December 15, 1997 against
payment in immediately available funds.
 
CREDIT SUISSE FIRST BOSTON
                            BEAR, STEARNS & CO. INC.
                                                    DONALDSON, LUFKIN & JENRETTE
                                                    SECURITIES CORPORATION
          The date of this prospectus supplement is December 10, 1997.
<PAGE>   2
 
                         PROSPECTUS SUPPLEMENT SUMMARY
 
     The following summary is qualified in its entirety by the information and
financial statements appearing elsewhere or incorporated by reference in this
Prospectus Supplement and in the accompanying Prospectus.
 
                                  THE COMPANY
 
     American Financial Group, Inc. ("AFG" or the "Company") is a holding
company which, through its subsidiaries, is engaged primarily in specialty and
multi-line property and casualty insurance businesses and in the sale of
tax-deferred annuities and certain life and health insurance products. AFG was
formed through the combination of American Premier Underwriters, Inc. ("APU")
and American Financial Corporation ("AFC") in a merger transaction completed in
April 1995 (the "Merger"). At September 30, 1997, the Company had total assets
of approximately $15.7 billion and shareholders' equity of $1.7 billion.
 
     AFG's property and casualty operations originated in 1872 and are the
twentieth largest property and casualty group in the United States based on 1996
statutory net premiums written of $2.8 billion, with assets of nearly $9 billion
and statutory capital and surplus of $1.7 billion. AFG has achieved outstanding
results that consistently outperform insurance industry averages by focusing on
highly specialized niche products and markets, supplemented with commercial
lines coverages and personal automobile products.
 
     AFG's annuity operations are headed by American Annuity Group, Inc.
("AAG"). AAG specializes in the sale and servicing of tax-deferred annuities to
employees of educational institutions and hospitals. In 1996, AAG's annuity
premiums were $574 million and assets reached $7 billion.
 
     During 1996, AFG continued to strengthen its financial position by retiring
approximately $300 million of AFC and APU debt which, coupled with the nearly
$850 million of debt retired or replaced with lower cost debt in 1995, resulted
in a 75% net reduction of aggregate debt since the Merger. Consequently, AFG's
debt to total capital ratio at the parent holding company level improved to
approximately 15% at the end of 1996. This trend has continued during the first
nine months of 1997 as AFC retired $84.3 million of its 9 3/4% Debentures for
$92.2 million in cash, APU repurchased $10.1 million of subordinated notes for
$11.1 million in cash, and AAG redeemed its outstanding 9 1/2% Senior Notes for
$42.5 million in cash, further reducing the ratio of debt to total capital to
11% at the parent holding company level.
 
                                  THE OFFERING
 
Securities Offered..............   $100 million aggregate principal amount of
                                   7 1/8% Senior Debentures due 2007 (the
                                   "Senior Debentures").
 
Maturity........................   December 15, 2007.
 
Interest Payment Dates..........   June 15 and December 15, commencing June 15,
                                   1998.
 
Ranking.........................   The Senior Debentures will be general
                                   unsecured obligations of the Company and will
                                   rank pari passu with other senior unsecured
                                   indebtedness of the Company (none at
                                   September 30, 1997). The Senior Debentures
                                   are structurally subordinated to indebtedness
                                   of the Company's subsidiaries, which
                                   indebtedness totaled approximately $390
                                   million at September 30, 1997.
 
     CERTAIN PERSONS PARTICIPATING IN THIS OFFERING MAY ENGAGE IN TRANSACTIONS
THAT STABILIZE, MAINTAIN, OR OTHERWISE AFFECT THE PRICE OF THE SECURITIES
OFFERED HEREBY, INCLUDING STABILIZING TRANSACTIONS, SYNDICATE SHORT COVERING
TRANSACTIONS AND PENALTY BIDS. FOR A DESCRIPTION OF THESE ACTIVITIES, SEE
"UNDERWRITING."
 
                                       S-2
<PAGE>   3
 
Optional Redemption.............   The Senior Debentures will be redeemable, in
                                   whole or in part, at the option of the
                                   Company at any time, at a redemption price
                                   equal to the sum of (i) the principal amount
                                   of Senior Debentures being redeemed plus
                                   interest thereon to the redemption date, and
                                   (ii) the Make-Whole Amount (as defined
                                   herein), if any. See "Description of Senior
                                   Debentures -- Optional Redemption."
 
Use of Proceeds.................   The net proceeds from the sale of the Senior
                                   Debentures offered hereby are expected to be
                                   approximately $98.9 million. The net proceeds
                                   will be used for general corporate purposes,
                                   which may include investment in insurance
                                   businesses and the repayment of other fixed
                                   rate securities of the Company and its
                                   subsidiaries. Pending application of the net
                                   proceeds as described herein, such net
                                   proceeds may be invested in short-term
                                   investments. See "Use of Proceeds."
 
                              RECENT DEVELOPMENTS
 
CORPORATE SIMPLIFICATION
 
     The Company was incorporated in July of 1997 to act as a holding company
for the Company's subsidiaries. On December 2, 1997, the Company completed
several transactions in furtherance of a plan to reduce corporate expenses and
simplify the public company structure of certain subsidiaries (the "Corporate
Simplification").
 
     To facilitate the Corporate Simplification, the shareholders of AFC Holding
Company (formerly known as American Financial Group, Inc. and referred to here
as "Old AFG") approved a plan of reorganization that provided for the formation
of the Company to act as the public parent corporation of Old AFG and all of its
subsidiaries. Old AFG shareholders received in exchange for each share of Old
AFG common stock, a share of common stock of the Company. No material change in
Old AFG's financial condition or in the rights of Old AFG security holders
occurred as a result of the reorganization.
 
     Old AFG and American Financial Enterprises, Inc. ("AFEI") engaged in a
merger transaction whereby the approximately 20% of the shares of AFEI not held
by Old AFG were exchanged either for shares of Company common stock on a 1-for-1
basis or for $37.00 per share in cash. The Company will pay approximately $23
million and issue approximately 2.1 million shares of Company common stock in
this transaction.
 
     A third component of the Corporate Simplification involved the merger of
AFC, a subsidiary of which Old AFG owned 100% of the common stock and 76% of the
voting equity securities, with a wholly-owned subsidiary of AFC. Pursuant to
such merger, holders of AFC's Series F and Series G Preferred Stock elected to
receive cash or shares of AFC Series J Preferred Stock. AFC will pay
approximately $245 million and issue approximately 2.9 million shares of Series
J Preferred Stock. The Series J Preferred Stock has a liquidation value of
$25.00 per share and will pay an annual dividend of $2.00 per share.
 
SALE OF SUBSIDIARY
 
     On December 1, 1997, AFG completed the sale of the assets of its
wholly-owned subsidiary, Millennium Dynamics, Inc., to a subsidiary of Peritus
Software Services, Inc. for $30 million in cash and 2,175,000 shares of Peritus
common stock. AFG estimates that its basis in the transaction plus fees and
expenses related to the sale will be $15 million to $20 million.
 
                                       S-3
<PAGE>   4
 
                    SUMMARY HISTORICAL FINANCIAL INFORMATION
 
The summary financial information of AFG set forth below (in millions, except
per share amounts) is derived from, and should be read in conjunction with, the
financial statements and other financial information which are incorporated
herein by reference. Results for interim periods are not necessarily indicative
of results to be expected for the year.
 
<TABLE>
<CAPTION>
                                  NINE MONTHS ENDED
                                    SEPTEMBER 30,                            YEAR ENDED DECEMBER 31,
                                ---------------------       ---------------------------------------------------------
                                  1997       1996(A)          1996        1995        1994        1993        1992
                                ---------   ---------       ---------   ---------   ---------   ---------   ---------
<S>                             <C>         <C>             <C>         <C>         <C>         <C>         <C>
EARNINGS STATEMENT DATA:
Total Revenues                  $ 2,968.2   $ 3,227.2       $ 4,115.4   $ 3,629.6   $ 2,104.3   $ 2,720.7   $ 3,928.9
Earnings (Loss) Before Income
  Taxes, Extraordinary Items
  and Accounting Change             254.5       355.6           353.3       246.9        43.6       262.0      (144.9)
Earnings (Loss):
  Before Extraordinary Items        158.1       261.1           262.0       190.4        18.9       224.7      (162.3)
  Extraordinary Items                (7.1)      (25.9)          (28.7)         .8       (16.8)       (4.6)         --
  Cumulative Effect of
    Accounting Change                  --          --              --          --          --          --        85.4
Net Earnings (Loss)                 151.0       235.2           233.3       191.2         2.1       220.1       (76.9)
 
EARNINGS (LOSS) PER COMMON
  SHARE (B):
  Before Extraordinary Items    $    2.65   $    4.30       $    4.31   $    3.87   ($    .24)  $    7.01   ($   6.66)
  Extraordinary Items                (.12)       (.43)           (.47)        .01        (.59)       (.16)         --
  Cumulative Effect of
    Accounting Change                  --          --              --          --          --          --        3.02
  Net Earnings (Loss)                2.53        3.87            3.84        3.88        (.83)       6.85       (3.64)
 
Cash Dividends Paid Per Share
  of Common Stock               $     .75   $     .75       $    1.00   $     .75          (c)         (c)         (c)
 
Ratio of Earnings to Fixed
  Charges (d)                        3.45        4.78            4.22        2.60        1.69        2.62        2.15
 
BALANCE SHEET DATA:
Total Assets                    $15,683.1   $14,954.4       $15,051.1   $14,953.9   $10,592.7   $10,077.5   $12,388.8
Long-term Debt                      390.9       663.8           517.9       882.1     1,106.7     1,054.0     2,009.2
Minority Interest (e)               672.0       315.4           494.4       314.4       105.5       109.2       812.7
Capital Subject to Mandatory
  Redemption                           --          --              --          --         2.9        49.2        27.7
Other Capital                     1,711.3     1,531.3         1,554.4     1,440.1       396.0       537.2       280.0
</TABLE>
 
- ---------------
 
(a) Earnings for the nine months of 1996 include net realized gains of $197
    million ($3.25 per share), principally from the sale of AFG's investment in
    Citicasters Inc., and a charge of $80 million ($1.31 per share) from a
    strengthening of the insurance reserves relating to asbestos and other
    environmental matters.
 
(b) The number of shares used for periods prior to April 1995 is the 28.3
    million AFG shares issued in exchange for AFC shares in the merger
    transactions completed in April 1995.
 
(c) Prior to the April 1995 mergers involving AFC and American Premier
    Underwriters, Inc. ("APU") which created AFG, AFC's common stock was
    privately held by members of the Lindner family. In 1995, APU declared and
    paid cash dividends per share of $.25 prior to the mergers; it also declared
    cash dividends of $.91 in 1994, $.85 in 1993 and $.81 in 1992. AFG declared
    two quarterly $.25 per share dividends in 1995 subsequent to the mergers.
 
(d) Fixed charges are computed on a "total enterprise" basis. For purposes of
    calculating the ratios, "earnings" have been computed by adding to pretax
    earnings (excluding discontinued operations) the fixed charges and the
    minority interest in earnings of subsidiaries having fixed charges and
    deducting (adding) the undistributed equity in earnings (losses) of
    investees. Fixed charges include interest (excluding interest on annuity
    funds) amortization of debt discount and expense, preferred dividend
    requirements of subsidiaries and a portion of rental expense deemed to be
    representative of the interest factor.
 
(e) Includes AFC preferred stock following the mergers in 1995 and preferred
    securities issued in 1996 and 1997 by trust subsidiaries.
 
                                       S-4
<PAGE>   5
 
                                  RISK FACTORS
 
     Prospective investors in the Senior Debentures should consider carefully
all of the information set forth in or incorporated by reference into this
Prospectus Supplement and the Prospectus and, in particular, the following,
before making an investment.
 
HOLDING COMPANY STRUCTURE; DIVIDEND RESTRICTIONS
 
     AFG, AFC and APU are organized as holding companies with almost all of
their operations being conducted by subsidiaries. These parent corporations,
however, have continuing expenditures for administrative expenses, corporate
services, the payment of principal and interest on borrowings and, with respect
to AFC, for dividends on AFC preferred stock. They rely primarily on dividends
and/or tax payments from their subsidiaries for funds to meet their obligations.
 
     Payments of dividends by the insurance subsidiaries of AFC and APU are
subject to various laws and regulations which limit the amount of dividends that
can be paid without prior approval from the applicable state Departments of
Insurance. In 1996, AFG's insurance company subsidiaries paid approximately $400
million in dividends, including approximately $190 million of dividends paid
with prior approval. Without prior Department of Insurance approval, the maximum
dividends that can be paid in 1997 by AFG's insurance subsidiaries is
approximately $225 million. In the first nine months of 1997, AFG's insurance
subsidiaries have paid $135 million in dividends, including approximately $32
million paid with prior approval. The maximum dividend permitted by law is not
indicative of an insurer's actual ability to pay dividends which may be further
constrained by business and regulatory considerations, such as the impact of
dividends on surplus, which could affect an insurer's ratings, competitive
position, the amount of premiums that can be written and the ability to pay
future dividends. Furthermore, each state Department of Insurance has broad
discretion to limit the payment of dividends by insurance companies domiciled in
that state.
 
     AFG believes that the amounts currently available through dividends and tax
payments without approval are sufficient to meet the expenditures of AFG, AFC
and APU. A prolonged material decline in insurance subsidiary profits or
materially adverse insurance regulatory developments, however, could subject
AFG, AFC or APU to shortages of cash because of their inability to receive
dividends from subsidiaries.
 
CYCLICALITY OF THE INSURANCE INDUSTRY; IMPACT OF CATASTROPHES
 
     AFG's insurance subsidiaries operate in a highly competitive industry that
is affected by many factors which can cause significant fluctuations in their
results of operations. The property and casualty insurance industry has
historically been subject to pricing cycles characterized by periods of intense
competition and lower premium rates (a "downcycle") followed by periods of
reduced competition, reduced underwriting capacity and higher premium rates (an
"upcycle"). The property and casualty insurance industry is currently in an
extended downcycle, which has lasted approximately eight years. The underwriting
results for AFG's property and casualty operations have been adversely affected
by this downcycle, particularly in unfavorable pricing in certain standard
commercial lines of business.
 
     As with other property and casualty insurers, AFG's operating results can
be adversely affected by unpredictable catastrophe losses. AFG's insurance
subsidiaries generally seek to reduce their exposure to such events through
individual risk selection and the purchase of reinsurance. Total net losses to
AFG's insurance operations from catastrophes were approximately $18 million
during the first nine months of 1997; $85 million in the year 1996; $70 million
in 1995; $56 million in 1994; $30 million in 1993; and $45 million in 1992.
 
REGULATION
 
     AFG's insurance subsidiaries are regulated under the insurance and
insurance holding company laws of their states of domicile and other states in
which they operate. These laws, in general, require approval of the particular
insurance regulators prior to certain actions by the insurance companies, such
as the payment of dividends in excess of statutory limitations (as discussed
under "Holding Company Structure; Dividend Restrictions" above) and certain
transactions and continuing service arrangements with affiliates. Regulation and
supervision of each
 
                                       S-5
<PAGE>   6
 
insurance subsidiary is administered by a state insurance commissioner who has
broad statutory powers with respect to the granting and revoking of licenses,
approvals of premium rates, forms of insurance contracts and types and amounts
of business which may be conducted in light of the policyholders' surplus of the
particular company. The statutes of most states provide for the filing of
premium rate schedules and other information with the insurance commissioner,
either directly or through rating organizations. The commissioner generally has
powers to disapprove such filings or make changes to the rates if they are found
to be excessive, inadequate or unfairly discriminatory. The determination of
rates is based on various factors, including loss and loss adjustment expense
experience. The failure to obtain, or delay in obtaining, the required approvals
could have an adverse impact on the operations of the Company's insurance
subsidiaries.
 
     The National Association of Insurance Commissioners has adopted the Risk
Based Capital For Insurers Model Act (the "Model Act") which applies to both
life and property and casualty companies. The risk-based capital formulas
determine the amount of capital that an insurance company needs to ensure that
it has an acceptably low expectation of becoming financially impaired. The Model
Act provides for increasing levels of regulatory intervention as the ratio of an
insurer's total adjusted capital and surplus decreases relative to its risk-
based capital, culminating with mandatory control of the operations of the
insurer by the domiciliary insurance department at the so-called "mandatory
control level." The risk-based capital formulas became effective in 1993 for
life companies and in 1994 for property and casualty companies.
 
RATINGS; COMPETITION
 
     A.M. Best, publisher of Best's Insurance Reports, Property-Casualty, has
given AFG's principal insurance subsidiaries a rating of "A" (Excellent).
Although some of the large insurance companies against which these insurers
compete have higher ratings, management believes that the current rating is
adequate to enable them to compete successfully. A downgrade in the A.M. Best
rating below "A" (Excellent) could adversely affect their competitive position.
 
     Great American Life Insurance Company ("GALIC"), the principal insurance
subsidiary of American Annuity Group, Inc., is rated "A" (Excellent). Management
believes that a rating in the "A" category is necessary to successfully market
tax-deferred annuities to public education employees and other not-for-profit
groups, the markets in which GALIC competes. A downgrade in the A.M. Best rating
below the "A" category could materially and adversely affect the competitive
position of GALIC.
 
     Prospective investors should realize that the ratings discussed above are
in no way a measure of protection offered to such investors, but are intended to
indicate the ability of certain of AFG's insurance subsidiaries to pay insurance
claims.
 
INVESTMENT PORTFOLIO; EFFECTS OF CHANGES IN INTEREST RATES
 
     AFG's investment portfolio consists primarily of fixed maturity securities,
such as investment grade, publicly traded corporate debt securities and
mortgage-backed securities. At September 30, 1997, 93% of AFG's investment
portfolio was invested in fixed maturity securities, of which approximately 24%
was invested in mortgage-backed securities. Certain risks are inherent in
connection with fixed maturity securities, including loss upon default and price
volatility in reaction to changes in interest rates and general market factors.
Certain additional risks are inherent with mortgage-backed securities, including
the risks associated with reinvestment of proceeds due to prepayments of such
obligations in a period of declining interest rates.
 
     ANNUITY PRODUCT CONCENTRATION; POTENTIAL IMPACT OF FUTURE CHANGES IN
FEDERAL INCOME TAX TREATMENT OF ANNUITY PRODUCTS
 
     GALIC's business is primarily the sale of tax-deferred annuities. Current
federal income tax laws generally permit the tax-deferred accumulation of
earnings on the premiums paid by an annuitant. Taxes, if any, are payable on the
accumulated tax-deferred earnings when those earnings are paid to the annuitant.
If the federal income tax laws were to change so that accumulated earnings on
annuity products do not enjoy the tax deferral described above, or such that
other savings and investment products were to achieve similar tax deferral
status, or such that tax rates were significantly lowered so that the
annuitant's ability to defer income tax on annuity earnings was no
 
                                       S-6
<PAGE>   7
 
longer a significant factor for the policyholder, consumer demand for the
affected annuity products could decline materially or be eliminated. From time
to time, proposals to one or more of these effects have been made in Congress
and no assurance can be given that a tax law change will not occur in the
future. If the demand for its annuity products were to decrease significantly
for any reason, GALIC's operations and financial condition could be materially
and adversely affected.
 
     In August 1996, a new federal law became effective which expanded the
ability of not-for-profit organizations to offer non-qualified deferred
compensation plans to their employees. The full impact of this change is
impossible to predict. However, if the increased availability of these plans
reduces the demand for annuities qualified under Section 403(b) of the Internal
Revenue Code, GALIC's business could be adversely affected. In addition, new
federal tax legislation was enacted in August 1997. AAG management believes that
such tax legislation primarily impacts variable annuity products which GALIC did
not offer until 1996, and the sales of which have been less than 10% of AAG's
revenues. As a result, AAG does not believe that such legislation will have a
material effect on its business.
 
ADEQUACY OF INSURANCE LOSS RESERVES
 
     The insurance subsidiaries of AFG establish reserves to cover their
estimated liability for losses and loss adjustment expense with respect to both
reported and unreported claims as of the end of each accounting period. By their
nature, such reserves do not represent an exact calculation of liabilities.
Rather, except for reserves related to asbestos and environmental ("A&E")
claims, such reserves are estimates involving management's projections as to the
ultimate settlement and administration of claims. These expectations are, in
turn, based on facts and circumstances known at the time, predictions of future
events, estimates of future trends in the severity and frequency of claims and
judicial theories of liability as well as inflation.
 
     Estimation of loss reserves for many specialty commercial lines of business
is more difficult than for certain standard commercial lines because claims may
not become apparent for a number of years (such period of time being referred to
as the "tail"), and a relatively higher proportion of ultimate losses is
considered incurred but not reported. As a result, variations in loss
development are more likely in these lines of business.
 
     Certain of AFG's insurance subsidiaries, including Great American Insurance
Company, face liabilities for A&E claims. A&E claims arise out of general
liability and commercial multi-peril policies issued prior to the early 1980's
when providing coverage for A&E exposures was not specifically contemplated by
such policies.
 
     The insurance industry typically includes only claims relating to polluted
waste sites and asbestos in defining environmental exposures. AFG extends its
definition of A&E claims to include claims relating to breast implants,
repetitive stress on keyboards, DES (a drug used in pregnancies years ago
alleged to cause cancer and birth defects) and other latent injuries.
 
     Establishing reserves for A&E claims is subject to uncertainties that are
greater than those presented by other types of claims. Factors contributing to
those uncertainties include a lack of historical data, long reporting delays,
uncertainty as to the number and identity of insureds with potential exposure,
unresolved legal issues regarding policy coverage and the extent and timing of
any such contractual liability. Courts have reached different and sometimes
inconsistent conclusions as to when a loss is deemed to have occurred, what
policies provide coverage, what claims are covered, whether there is an insured
obligation to defend, how policy limits are determined and other policy
provisions. Management believes these issues are not likely to be resolved in
the near future and that, as a result, a reasonable estimate of ultimate
liability for A&E exposure is not possible at this time. The reserves for A&E
exposures for AFG's insurance subsidiaries are reevaluated regularly based on an
analysis of the insurers' exposures, together with industry reserving levels and
financial reporting principles.
 
     During 1995 and 1996, a number of insurers recorded large reserve increases
for A&E exposures. By the end of 1995, the industry's three-year survival ratio
(reserves divided by three-year average annual paid losses) for A&E claims had
increased from a multiple of six times in recent years to more than nine times.
In the third quarter of 1996, AFG strengthened its A&E reserve to approximately
10.5 times average annual paid losses based upon these revised insurance
industry standards for reserving such claims. This action resulted in a
non-cash,
 
                                       S-7
<PAGE>   8
 
pretax charge of approximately $80 million. AFG's A&E reserves (net of
reinsurance recoverable) at December 31, 1996 were approximately $340 million.
 
     AFG regularly reviews its reserving techniques and reserve positions and
believes that adequate provision has been made for loss reserves. Nevertheless,
there can be no assurance that currently established reserves will prove
adequate in light of subsequent actual experience. Future earnings could be
adversely impacted should future loss development require increases in reserves
previously established.
 
REINSURANCE
 
     AFG relies to a certain extent on the use of reinsurance to limit the
amount of risk it retains. The availability and cost of reinsurance are subject
to prevailing market conditions which are beyond AFG's control and which may
affect its level of business and profitability. As of December 31, 1996, AFG had
reinsurance recoverables of approximately $720 million, representing estimated
amounts recoverable from reinsurers pertaining to paid and unpaid claims. AFG is
subject to credit risk with respect to its reinsurers, as the ceding of risk to
reinsurers does not relieve AFG of its liability to insureds.
 
USX LITIGATION
 
     In May 1994, lawsuits were filed against APU by USX Corporation ("USX") and
its former subsidiary, Bessemer and Lake Erie Railroad Company ("B&LE"), seeking
contribution by APU, as the successor to the railroad business conducted by Penn
Central Transportation Company ("PCTC") prior to 1976, for all or a portion of
the approximately $600 million that USX paid in satisfaction of a judgment
against B&LE in 1991 for its participation in an unlawful antitrust conspiracy
among certain railroads commencing in the 1950's and continuing through the
1970's. The lawsuits argue that USX's liability for that payment was
attributable to PCTC's alleged activities in furtherance of the conspiracy. APU
argued that the lawsuits were barred by an order issued in connection with
PCTC's bankruptcy reorganization.
 
     In May 1996, the U.S. Supreme Court declined to hear APU's petition with
respect to the bankruptcy bar issue, thereby permitting USX's lawsuits to
proceed. APU and its outside counsel continue to believe that APU has
substantial defenses and should not suffer a material loss as a result of this
litigation.
 
                                       S-8
<PAGE>   9
 
                                 CAPITALIZATION
 
     The following table sets forth the historical capitalization of the Company
at September 30, 1997, and as adjusted to give pro forma effect to the sale of
the Senior Debentures by AFG.
 
<TABLE>
<CAPTION>
                                                                          SEPTEMBER 30, 1997
                                                                       ------------------------
                                                                       HISTORICAL    PRO FORMA
                                                                       ----------    ----------
                                                                            (IN THOUSANDS)
<S>                                                                    <C>           <C>
Long-term debt:
  Direct obligations of AFG..........................................  $        -    $  100,000
  Obligations of AFG subsidiaries:
     American Financial Corporation (parent only)....................      88,586        88,586
     American Premier Underwriters (parent only).....................     155,133       155,133
     American Annuity Group, Inc.....................................      84,966        84,966
     Other subsidiaries..............................................      62,168        62,168
                                                                        ---------     ---------
          Total long-term debt.......................................     390,853       490,853
Minority interest(a).................................................     671,989       671,989
Shareholder's equity:(a)
  Common Stock and capital surplus...................................     780,642       780,642
  Retained earnings..................................................     612,433       612,433
  Net unrealized gain on marketable securities, net of deferred
     income tax......................................................     318,200       318,200
                                                                        ---------     ---------
          Total shareholders' equity.................................   1,711,275     1,711,275
                                                                        ---------     ---------
 
Total capitalization.................................................  $2,774,117    $2,874,117
                                                                        =========     =========
</TABLE>
 
- ---------------
 
(a) Minority interest represents the interests of noncontrolling shareholders in
    AFG subsidiaries, including AFC preferred stock and preferred securities
    issued by trust subsidiaries of AFG. The above table does not give effect to
    the Corporate Simplification completed on December 2, 1997, which had the
    effect of decreasing minority interest by $167 million and shareholder's
    equity by approximately $85 million.
 
                                       S-9
<PAGE>   10
 
                                USE OF PROCEEDS
 
     The net proceeds received by the Company from the sale of Senior Debentures
offered hereby are expected to be used for general corporate purposes, which may
include investment in insurance businesses and the repayment of other fixed rate
securities of the Company and its subsidiaries. Until the net proceeds are used
for these purposes, the Company may deposit them in interest-bearing accounts or
invest them in short-term marketable securities.
 
                        DESCRIPTION OF SENIOR DEBENTURES
 
     The following description of the particular terms of the Senior Debentures
offered hereby (referred to in the Prospectus as "Senior Debt Securities")
supplements, and to the extent inconsistent therewith replaces, the description
of the general terms and provisions of Senior Debt Securities set forth in the
Prospectus, to which description reference is hereby made.
 
GENERAL
 
     The Senior Debentures are to be issued as a series of Senior Debt
Securities under the Indenture, dated as of November 12, 1997, as supplemented
to date, between the Company and Star Bank, N.A., as Trustee (the "Trustee"),
which is also described in the accompanying Prospectus.
 
     The following statements are summaries of certain terms of the Senior
Debentures adopted pursuant to the provisions of, and incorporated into, the
Indenture. These statements do not purport to be complete and are qualified in
their entirety by reference to the terms of the Senior Debentures which will be
filed as exhibits to the Company's Current Report on Form 8-K dated December 12,
1997, which will be incorporated by reference in the accompanying Prospectus.
 
     The Senior Debentures will be general unsecured obligations of the Company
and will rank pari passu with other senior unsecured indebtedness of the
Company. The Senior Debentures are structurally subordinated to all indebtedness
of the Company's subsidiaries.
 
PRINCIPAL, MATURITY, INTEREST AND DENOMINATION
 
     The Senior Debentures will be limited to $100 million aggregate principal
amount and will mature on December 15, 2007. The Senior Debentures will bear
interest per annum from December 15, 1997 or from the most recent Interest
Payment Date to which interest has been paid or provided for, payable
semi-annually on June 15 and December 15 of each year, commencing June 15, 1998,
to the person in whose name a Senior Debenture is registered at the close of
business on June 1 or December 1, as the case may be, next preceding such
Interest Payment Date. The Senior Debentures will be issued in book entry form
in denominations of $1,000 and integral multiples thereof.
 
OPTIONAL REDEMPTION
 
     The Senior Debentures will be subject to redemption at the option of the
Company, in whole or in part, upon not less than 30 nor more than 60 days'
notice, at a redemption price equal to the sum of (i) the principal amount of
the Senior Debentures being redeemed plus accrued interest thereon to the
redemption date, and (ii) the Make-Whole Amount (as defined below), if any, with
respect to such Senior Debentures.
 
     "Make-Whole Amount" means, in connection with any optional redemption of
any Senior Debentures, the excess, if any, of (i) the sum, as determined by a
Quotation Agent (as defined herein) of the present values of the principal
amount of such Senior Debentures, together with scheduled payments of interest
from the redemption date to the Stated Maturity of the Senior Debentures, in
each case discounted to the redemption date on a semi-annual basis (assuming a
360-day year consisting of twelve 30-day months) at the Adjusted Treasury Rate
(as defined herein) over (ii) 100% of the principal amount of the Senior
Debentures to be redeemed.
 
     "Adjusted Treasury Rate" means, with respect to any redemption date, the
rate per annum equal to the semi-annual equivalent yield to maturity of the
Comparable Treasury Issue, calculated using a price for the
 
                                      S-10
<PAGE>   11
 
Comparable Treasury Issue (expressed as a percentage of its principal amount)
equal to the Comparable Treasury Price for such redemption date, calculated on
the third Business Day preceding the redemption date, plus in each case 0.20%
(20 basis points).
 
     "Comparable Treasury Issue" means the U.S. Treasury 6.125% Note due August
15, 2007. If such security shall cease to be outstanding then Comparable
Treasury Issue shall mean the United States Treasury security selected by the
Quotation Agent as having a maturity comparable to the remaining term from the
redemption date to the Stated Maturity Date of the Senior Debentures that would
be utilized, at the time of selection and in accordance with customary financial
practice, in pricing new issues of corporate debt securities of comparable
maturity to the remaining term of the Senior Debentures.
 
     "Quotation Agent" means the Reference Treasury Dealer selected by the
Indenture Trustee after consultation with the Company. "Reference Treasury
Dealer" means a primary U.S. Government securities dealer.
 
     "Comparable Treasury Price" means, with respect to any redemption date, (i)
the average of the bid and asked prices for the Comparable Treasury Issue
(expressed in each case as a percentage of its principal amount) on the third
Business Day preceding such redemption date, as set forth in the daily
statistical release (or any successor release) published by the Federal Reserve
Bank of New York and designated "Composite 3:30 p.m. Quotations for U.S.
Government Securities" or (ii) if such release (or any successor release) is not
published or does not contain such prices on such Business Day, (A) the average
of the Reference Treasury Dealer Quotations for such redemption date, after
excluding the highest and lowest such Reference Treasury Dealer Quotations, or
(B) if the Indenture Trustee obtains fewer than three such Reference Treasury
Dealer Quotations, the average of such Quotations.
 
     "Reference Treasury Dealer Quotations" means, with respect to each
Reference Treasury Dealer and any prepayment date, the average, as determined by
the Indenture Trustee, of the bid and asked prices for the Comparable Treasury
Issue (expressed in each case as a percentage of its principal amount) quoted in
writing to the Indenture Trustee by such Reference Treasury Dealer at 5:00 p.m.,
New York City time, on the third Business Day preceding such redemption date.
 
BOOK-ENTRY, DELIVERY AND FORM
 
     The Senior Debentures will initially be issued in the form of one Global
Debenture (the "Global Debenture") held in book-entry form. The Global Debenture
will be deposited on the date of the closing of the sale of the Senior
Debentures offered hereby (the "Closing Date") with, or on behalf of, The
Depository Trust Company ("DTC" or the "Depository") and registered in the name
of Cede & Co., as nominee of the Depository (such nominee being referred to
herein as the "Global Debenture holder").
 
     DTC has advised the Company that it is a limited-purpose trust company that
was created to hold securities for its participating organizations
(collectively, the "Participants" or the "Depository's Participants") and to
facilitate the clearance and settlement of transactions in such securities
between Participants through electronic book-entry changes in accounts of its
Participants. The Depository's Participants include securities brokers and
dealers (including the Underwriters), banks and trust companies, clearing
corporations and certain other organizations. Access to the Depository's system
is also available to other similar entities (collectively, the "Indirect
Participants" or the "Depository's Indirect Participants") that clear through or
maintain a custodial relationship with a Participant, either directly or
indirectly. Persons who are not Participants may beneficially own securities
held by or on behalf of the Depository only through the Depository's
Participants or the Depository's Indirect Participants.
 
     Under the Indenture, beneficial owners of Senior Debentures evidenced by
the Global Debenture will not be considered the owners or holders thereof for
any purpose, including with respect to the giving of any directions,
instructions or approvals to the Trustee or receiving notices thereunder.
Neither the Company nor the Trustee will have any responsibility or liability
for any aspect of the records of the Depository or any of its Participants or
Indirect Participants or for maintaining, supervising or reviewing any records
of the Depository or any of its Participants or Indirect Participants relating
to the Senior Debentures.
 
                                      S-11
<PAGE>   12
 
     A Global Debenture may not be transferred except as a whole by DTC to a
nominee of DTC. A Global Debenture representing Senior Debentures is
exchangeable only if (1) DTC notifies the Company that it is unwilling or unable
to continue as a Depository for such Global Debenture or if at any time DTC
ceases to be a clearing agency registered under the Exchange Act, (2) the
Company in its sole discretion determines that some or all such Global
Debentures shall be exchangeable or (3) there shall have occurred and be
continuing an Event of Default or an event which with the giving of notice or
lapse of time or both would constitute an Event of Default with respect to the
Senior Debentures represented by such Global Debentures. Any Global Debenture
that is exchangeable pursuant to the preceding sentence shall be exchangeable
for certificates in definitive form representing Senior Debentures in authorized
denominations and registered in such names as the Depository holding such Global
Debenture shall direct. Subject to the foregoing, the Global Debenture is not
exchangeable, except for a Global Debenture of like denomination to be
registered in the name of the Depository or its nominee.
 
     Payments in respect of the principal of and interest on any Senior
Debentures registered in the name of the Global Debenture holder on the
applicable record date will be payable by the Trustee to or at the direction of
the Global Debenture holder in its capacity as the registered Holder under the
Indenture. Under the terms of the Indenture, the Company and the Trustee may
treat the persons in whose names the Senior Debentures, including the Global
Debenture, are registered as the owners thereof for the purpose of receiving
such payments. Consequently, neither the Company nor the Trustee has or will
have any responsiblity or liability for the payment of such amounts to
beneficial owners of the Senior Debentures (including principal or interest).
DTC has informed the Company, however, that it is currently the policy of the
Depository to immediately credit the accounts of the relevant Participants with
such payments, in amounts proportionate to their respective holdings of
beneficial interests in the relevant security as shown on the records of the
Depository. Payments by the Depository's Participants and the Depository's
Indirect Participants to the beneficial owners of the Senior Debentures will be
governed by standing instructions and customary practice and will be the
responsibility of the Depository's Participants or the Depository's Indirect
Participants.
 
                                  UNDERWRITING
 
     The Underwriters named below (the "Underwriters") have severally agreed,
subject to the terms and conditions of the Underwriting Agreement dated December
10, 1997 (the "Underwriting Agreement"), to purchase from the Company the
principal amount of Senior Debentures set forth opposite their respective names
below:
 
<TABLE>
<CAPTION>
                                                                                  PRINCIPAL
                                                                                  AMOUNT OF
                                                                                    SENIOR
                                UNDERWRITER                                       DEBENTURES
- ----------------------------------------------------------------------------     ------------
<S>                                                                              <C>
Credit Suisse First Boston Corporation......................................     $ 33,400,000
Bear, Stearns & Co. Inc. ...................................................       33,300,000
Donaldson, Lufkin & Jenrette Securities Corporation.........................       33,300,000
                                                                                 ------------
  Total.....................................................................     $100,000,000
                                                                                 ============
</TABLE>
 
     The Underwriting Agreement provides that the obligations of the
Underwriters to purchase the Senior Debentures are subject to certain conditions
and that if any of the Senior Debentures are purchased by the Underwriters
pursuant to the Underwriting Agreement all the Senior Debentures agreed to be
purchased by the Underwriters must be so purchased. The Underwriting Agreement
provides that, in the event of a default by an Underwriter, in certain
circumstances the purchase commitments of non-defaulting Underwriters may be
increased or the Underwriting Agreement may be terminated.
 
     The Company has been advised by the Underwriters that they propose to offer
the Senior Debentures offered hereby to the public initially at the public
offering price set forth on the cover page of this Prospectus Supplement and to
certain dealers (who may include Underwriters) at such public offering price
less a concession of 0.40% of the principal amount per Senior Debenture. The
Underwriters and such dealers may allow a discount to certain other dealers of
0.25% of the principal amount per Senior Debenture. After the initial public
offering of the Senior Debentures, the public offering price and such
concessions may be changed by the Underwriters.
 
                                      S-12
<PAGE>   13
 
     The Senior Debentures are a new issue of securities and there is no public
market for them. The Company does not intend to apply for listing of the Senior
Debentures on any national securities exchange or for quotation of the Senior
Debentures on any automated quotation system. The Company has been advised by
the Underwriters that they intend to make a market in the Senior Debentures;
however, they are not obligated to do so, and market making with respect to the
Senior Debentures may be discontinued at any time, for any reason, without
notice. There can be no assurance that an active public market for the Senior
Debentures will develop or, if a market does develop, at what prices the Senior
Debentures will trade.
 
     The Company has agreed to indemnify the Underwriters against certain
liabilities, including civil liabilities under the Securities Act of 1933, as
amended, or to contribute to payments which the Underwriters may be required to
make in respect thereof.
 
     Certain of the Underwriters have provided from time to time, and expect to
provide in the future, financial advisory and investment banking services to the
Company and its affiliates, for which such Underwriters have received and will
receive customary fees and commissions.
 
     The Underwriters may engage in stabilizing transactions, syndicate covering
transactions and penalty bids. Stabilizing transactions permit bids to purchase
the underlying security so long as the stabilizing bids do not exceed a
specified maximum. Syndicate covering transactions involve purchases of the
Senior Debentures in the open market after the distribution has been completed
in order to cover syndicate short positions. Penalty bids permit the
Underwriters to reclaim a selling concession from a syndicate member when the
Senior Debentures originally sold by such syndicate member are purchased in a
syndicate covering transaction to cover syndicate short positions. Such
stabilizing transactions, syndicate covering transactions and penalty bids may
cause the price of the Senior Debentures to be higher than it would otherwise be
in the absence of such transactions.
 
                          NOTICE TO CANADIAN RESIDENTS
 
RESALE RESTRICTIONS
 
     The distribution of the Senior Debentures in Canada is being made only on a
private placement basis exempt from the requirement that the Company prepare and
file a prospectus with the securities' regulatory authorities in each province
where trades of Senior Debentures are effected. Accordingly, any resale of the
Senior Debentures in Canada must be made in accordance with applicable
securities laws which will vary depending on the relevant jurisdiction, and
which may require resales to be made in accordance with available statutory
exemptions or pursuant to a discretionary exemption granted by the applicable
Canadian securities regulatory authority. Purchasers are advised to seek legal
advice prior to any resale of the Senior Debentures.
 
REPRESENTATIONS OF PURCHASERS
 
     Each purchaser of Senior Debentures in Canada who receives a purchase
confirmation will be deemed to represent to the Company and the dealer from whom
such purchase confirmation is received that (i) such purchaser is entitled under
applicable provincial securities laws to purchase such Senior Debentures without
the benefit of a prospectus qualified under such securities laws, (ii) where
required by law, that such purchaser is purchasing as principal and not as
agent, and (iii) such purchaser has reviewed the text above under "Resale
Restrictions".
 
RIGHTS OF ACTION (ONTARIO PURCHASERS)
 
     The securities being offered are those of a foreign issuer and Ontario
purchasers will not receive the contractual right of action prescribed by
section 32 of the Regulation under the Securities Act (Ontario). As a result,
Ontario purchasers must rely on other remedies that may be available, including
common law rights of action for damages or rescission of rights of action under
the civil liability provisions of the U.S. federal securities laws.
 
                                      S-13
<PAGE>   14
 
ENFORCEMENT OF LEGAL RIGHTS
 
     All of the issuer's directors and officers as well as the experts named
herein may be located outside of Canada and, as a result, it may not be possible
for Canadian purchasers to effect service of process within Canada upon the
issuer or such persons. All or a substantial portion of the assets of the issuer
and such persons may be located outside of Canada and, as a result, it may not
be possible to satisfy a judgment against the issuer of such persons in Canada
or to enforce a judgment obtained in Canadian courts against such issuer or
persons outside of Canada.
 
NOTICE TO BRITISH COLUMBIA RESIDENTS
 
     A purchaser of Senior Debentures to whom the Securities Act (British
Columbia) applies is advised that such purchaser is required to file with the
British Columbia Securities Commission a report within ten days of the sale of
any Senior Debentures acquired by such purchaser pursuant to this offering. Such
report must be in the form attached to British Columbia Securities Commission
Blanket Order BOR #95/17, a copy of which may be obtained from the Company. Only
one such report must be filed in respect of Senior Debentures acquired on the
same date and under the same prospectus exemption.
 
TAXATION AND ELIGIBILITY FOR INVESTMENT
 
     Canadian purchasers of Senior Debentures should consult their own legal and
tax advisers with respect to the tax consequence of an investment in the Senior
Debentures in their particular circumstances and with respect to the eligibility
of the Senior Debentures for investment by the purchaser under relevant Canadian
legislation.
 
                                      S-14
<PAGE>   15
 
PROSPECTUS
 
                                  $500,000,000
 
                         AMERICAN FINANCIAL GROUP, INC.
 
                        DEBT SECURITIES AND COMMON STOCK
                                      AND
 
                      AMERICAN FINANCIAL CAPITAL TRUST II
   PREFERRED SECURITIES GUARANTEED TO THE EXTENT SET FORTH HEREIN BY AMERICAN
                             FINANCIAL GROUP, INC.
 
     American Financial Group, Inc. ("AFG" or the "Company") may from time to
time offer, together or separately, (i) in one or more series, unsecured debt
securities which may be either senior or subordinated debt securities (together,
the "Debt Securities"), consisting of debentures, notes and/or other evidences
of indebtedness and (ii) shares of its Common Stock, without par value ("Common
Stock"), in amounts, at prices and on terms to be determined at the time of the
offering.
 
     American Financial Capital Trust II, a statutory business trust formed
under the laws of the State of Delaware (the "Trust"), may from time to time
offer preferred securities, representing undivided beneficial interests in the
assets of the Trust ("Preferred Securities"). The payment of periodic cash
distributions ("Distributions") with respect to Preferred Securities will be
made from moneys held by the Trust, and payments on liquidation, redemption or
otherwise with respect to such Preferred Securities, will be guaranteed (a
"Trust Guarantee") by the Company to the extent described herein. See
"Description of Trust Guarantee." The Company's obligations under the Trust
Guarantee will rank junior and subordinate in right of payment to all other
liabilities of the Company and pari passu with its obligations under the
senior-most preferred or preference stock of the Company. See "Description of
Trust Guarantee -- Status of Trust Guarantees." The proceeds from the offering
of Preferred Securities and Common Securities (as defined herein) by the Trust
will be invested in subordinated debt securities of the Company. The
subordinated debt securities purchased by the Trust may be subsequently
distributed pro rata to holders of Preferred Securities and Common Securities in
connection with the dissolution of the Trust, upon the occurrence of certain
events as may be described in an accompanying supplement to the prospectus
("Prospectus Supplement").
 
     The Debt Securities, Common Stock and Preferred Securities (collectively
the "Securities") may be offered as separate series or issuances at an aggregate
initial public offering price not to exceed $500,000,000 or, if applicable, the
equivalent thereof in one or more foreign currencies or in amounts determined by
reference to an index as shall be designated by the Company or the Trust. While
the amount of the various Securities to be offered, as well as the prices and
terms of issuance, will be determined in light of market conditions at the time
of sale, none of the Debt Securities, Common Stock nor Preferred Securities will
individually exceed an initial public offering price of $300,000,000.
 
     Specific terms of the particular Securities covered by this Prospectus will
be set forth in a Prospectus Supplement which will describe, where applicable,
(i) in the case of Debt Securities, the specific designation, aggregate
principal amount, ranking as senior or subordinated debt securities,
denominations, maturity, any interest rate and method of calculating payment of
any interest, dates on which any premium or any interest is payable, any terms
for redemption, any terms for sinking fund payments, any terms for conversion or
exchange into other securities, any right of the Company to defer payment of
interest on the Debt Securities, and the maximum length of such deferral period,
subordination terms, currency or currencies of denomination and payment, if
other than U.S. dollars, the purchase price, any listing on a securities
exchange and any other terms in connection with the offering and sale of the
Debt Securities in respect of which this Prospectus is delivered; (ii) in the
case of Common Stock, the number of shares offered and the terms of the offering
and sale thereof, (iii) in the case of Preferred Securities, the specific
designation, number of securities, liquidation preference per security, the
purchase price, any listing on a securities exchange, distribution rate (or
method of calculation thereof), dates on which distributions shall be payable
and dates from which distributions shall accrue, any voting rights, terms for
any conversion or exchange into other securities, any redemption, exchange or
sinking fund provisions, any other rights, preferences, privileges, limitations
or restrictions relating to the Preferred Securities and the terms upon which
the proceeds of the sale of the Preferred Securities shall be used to purchase a
specific series of Debt Securities of the Company. The Debt Securities may be
issued in registered or bearer form, or both. If so specified in the applicable
Prospectus Supplement, Securities may be issued in whole or in part in the form
of one or more temporary or permanent global securities.
 
     The Securities may be sold by the Company or the Trust directly, or to or
through underwriters or through dealers or agents. See "Plan of Distribution."
The names of any underwriters, dealers or agents involved in the sale of the
Securities in respect of which this Prospectus is being delivered and any
applicable fee, commission or discount arrangements with them will be set forth
in the applicable Prospectus Supplement. See "Plan of Distribution" for possible
indemnification arrangements for dealers, underwriters and agents.
 
    This Prospectus may not be used to consummate sales of Securities unless
                    accompanied by a Prospectus Supplement.
                            ------------------------
 
     THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES
AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE
SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED
UPON THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE
CONTRARY IS A CRIMINAL OFFENSE.
                            ------------------------
 
               The date of this Prospectus is December 10, 1997.
<PAGE>   16
 
     NO PERSON HAS BEEN AUTHORIZED TO GIVE ANY INFORMATION OR TO MAKE ANY
REPRESENTATIONS OTHER THAN THOSE CONTAINED IN THIS PROSPECTUS, ANY ACCOMPANYING
PROSPECTUS SUPPLEMENT OR THE DOCUMENTS INCORPORATED OR DEEMED INCORPORATED BY
REFERENCE HEREIN, AND ANY INFORMATION OR REPRESENTATIONS NOT CONTAINED HEREIN OR
THEREIN MUST NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED BY THE COMPANY OR THE
TRUST OR BY ANY AGENT, DEALER OR UNDERWRITER. THIS PROSPECTUS AND ANY
ACCOMPANYING PROSPECTUS SUPPLEMENT DO NOT CONSTITUTE AN OFFER TO SELL OR A
SOLICITATION OF AN OFFER TO BUY THE SECURITIES IN ANY CIRCUMSTANCES IN WHICH
SUCH OFFER OR SOLICITATION IS UNLAWFUL. THE DELIVERY OF THIS PROSPECTUS OR ANY
PROSPECTUS SUPPLEMENT AT ANY TIME DOES NOT IMPLY THAT THE INFORMATION HEREIN OR
THEREIN IS CORRECT AS OF ANY TIME SUBSEQUENT TO THE DATE OF SUCH INFORMATION.
 
                             AVAILABLE INFORMATION
 
     The Company is subject to the informational requirements of the Securities
Exchange Act of 1934 (the "Exchange Act"), and in accordance therewith files
periodic reports, proxy and information statements and other information with
the Securities and Exchange Commission (the "Commission"). The Company has filed
a Registration Statement on Form S-3 (the "Registration Statement") with the
Commission under the Securities Act of 1933 (the "Securities Act") with respect
to the Securities. This Prospectus does not contain all the information,
exhibits and undertakings contained in the Registration Statement, to which
reference is hereby made. Statements contained in this Prospectus as to the
terms of any contract or other document are not necessarily complete with
respect to each such contract, agreement or other document filed as an exhibit
to the Registration Statement. Reference is made to the exhibits for a more
complete description of the matter involved. Such reports, proxy and information
statements, the Registration Statement and other information filed with the
Commission by AFG may be inspected at and obtained from the Commission at its
public reference facilities at 450 Fifth Street, N.W., Washington, D.C. 20549,
and at the Commission's regional offices located at Suite 1400, 500 West Madison
Avenue, Chicago, Illinois, and at 7 World Trade Center, 13th Floor, New York,
New York. Copies of such material can also be obtained, at prescribed rates, by
mail from the Public Reference Section of the Commission at its Washington, D.C.
address set forth above. Such material may also be accessed electronically by
means of the Commission's home page on the World Wide Web located at
http://www.sec.gov. In addition, material filed by the Company can be obtained
and inspected at the offices of the New York Stock Exchange, Inc., 20 Broad
Street, New York, New York 10005 (the "NYSE"), on which AFG's Common Stock is
listed.
 
     No separate financial statements of the Trust have been included or
incorporated by reference herein. The Company does not consider that such
financial statements would be material to holders of the Preferred Securities
because (i) all of the voting securities of the Trust will be owned, directly or
indirectly, by the Company, a reporting company under the Exchange Act, (ii) the
Trust has no independent operations but exists for the sole purpose of issuing
securities representing undivided beneficial interests in its assets and
investing the proceeds thereof in Debt Securities issued by the Company, and
(iii) the obligations of the Trust under the Preferred Securities are fully and
unconditionally guaranteed by the Company to the extent that the Trust shall
have funds available to meet such obligations. See "Description of Preferred
Securities" and "Description of Trust Guarantees."
 
                                        2
<PAGE>   17
 
                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE
 
     This Prospectus incorporates by reference certain documents relating to the
Company which are not delivered herewith. These documents (other than the
exhibits to such documents, unless such exhibits are specifically incorporated
by reference into such documents) are available, without charge, on oral or
written request by any person to whom this Prospectus is delivered. Written or
telephone requests should be directed to Fred J. Runk, Senior Vice President and
Treasurer, One East Fourth Street, Cincinnati, Ohio 45202, telephone (513)
579-2488. The following documents, which have been filed by the Company's
predecessor (File No. 1-11453) with the Commission, are hereby incorporated by
reference in this Prospectus:
 
           (i) Annual Report on Form 10-K for the year ended December 31, 1996,
               as amended on April 30, 1997 and October 29, 1997;
 
           (ii) Quarterly Reports on Form 10-Q for the quarters ended March 31,
                1997, June 30, 1997 and September 30, 1997; and
 
          (iii) Current Report on Form 8-K dated July 14, 1997.
 
     The Company's Current Report on Form 8-K dated December 3, 1997 (File No.
1-13653) is hereby incorporated by reference in this Prospectus.
 
     All documents subsequently filed by the Company pursuant to Sections 13(a),
13(c), 14 or 15(d) of the Exchange Act prior to the termination of this Offering
shall be deemed to be incorporated by reference in this Prospectus and to be a
part of this Prospectus from the date of filing thereof.
 
     Any statement contained in a document incorporated by reference herein
shall be deemed to be modified or superseded for purposes of this Prospectus to
the extent that a statement contained herein or in any other subsequently filed
document which also is or is deemed to be incorporated by reference herein
modifies or supersedes such statement. Any such statement so modified or
superseded shall not be deemed, except as so modified or superseded, to
constitute a part of this Prospectus.
 
                                        3
<PAGE>   18
 
                                  THE COMPANY
 
     American Financial Group, Inc. ("AFG" or the "Company") is a holding
company which, through its subsidiaries, is engaged primarily in specialty and
multi-line property and casualty insurance businesses and in the sale of
tax-deferred annuities and certain life and health insurance. AFG's property and
casualty operations originated in 1872 and are the twentieth largest property
and casualty group in the United States based on 1996 statutory net premiums
written of $2.8 billion. At September 30, 1997, the Company had total assets of
$15.7 billion and shareholders' equity of $1.7 billion.
 
                                   THE TRUST
 
     The Trust is a statutory business trust formed under Delaware law pursuant
to (i) a declaration of trust (the "Declaration") executed by the Company as
sponsor for such trust (the "Sponsor"), and the Trustees (as defined herein) of
such trust and (ii) the filing of a certificate of trust with the Secretary of
State of the State of Delaware on February 4, 1997. The Trust will engage solely
in the following activities: (i) issuing and selling the Preferred Securities
and common securities representing undivided beneficial interests in the assets
of the Trust (the "Common Securities" and, together with the Preferred
Securities, the "Trust Securities"), (ii) using the gross proceeds from the sale
of the Trust Securities to acquire the Debt Securities and (iii) engaging in
only those other activities necessary or incidental thereto. All of the Common
Securities will be directly or indirectly owned by the Company. The Common
Securities will rank pari passu, and payments will be made thereon pro rata,
with the Preferred Securities, except that, if an event of default under the
Declaration has occurred and is continuing, the rights of the holders of the
Common Securities to payment in respect of distributions and payments upon
liquidation, redemption and otherwise will be subordinated to the rights of the
holders of the Preferred Securities. The Company will directly or indirectly
acquire Common Securities, in an aggregate liquidation amount equal to at least
3% of the total capital of the Trust.
 
     The Trust's business and affairs will be conducted by the trustees (the
"Trustees") appointed by the Company as the direct or indirect holder of all of
the Common Securities. The holder of the Common Securities will be entitled to
appoint, remove or replace any of, or increase or reduce the number of, the
Trustees of the Trust. The duties and obligations of the Trustees shall be
governed by the Declaration. The Trust will have three Trustees (the "Regular
Trustees") who are employees or officers of or who are affiliated with the
Company. One Trustee of the Trust will be a financial institution that is not
affiliated with the Company and has a minimum amount of combined capital and
surplus of not less than $50,000,000, which shall act as property trustee and as
indenture trustee for the purposes of compliance with the provisions of Trust
Indenture Act of 1939 (the "Trust Indenture Act"), pursuant to the terms set
forth in the applicable Prospectus Supplement (the "Property Trustee"). In
addition, unless the Property Trustee maintains a principal place of business in
the State of Delaware and otherwise meets the requirements of applicable law,
one Trustee of the Trust will be an entity having a principal place of business
in, or a natural person resident of, the State of Delaware (the "Delaware
Trustee"). The Company will pay all fees and expenses related to the Trust and
the offering of the Trust Securities.
 
     The Property Trustee for the Trust is The Bank of New York and its
principal corporate trust office is at 101 Barclay Street, 21st Floor, New York,
New York 10286, Attention: Corporate Trust Trustee Administration. The Delaware
Trustee for the Trust is The Bank of New York (Delaware) and its address in the
State of Delaware is White Clay Center, Route 273, Newark, Delaware 19711. The
Delaware Trustee is an affiliate of the Property Trustee. The address for the
Trust is c/o American Financial Group, Inc., the Sponsor of the Trust, at the
Company's corporate headquarters located at One East Fourth Street, Cincinnati,
Ohio 45202, telephone (513) 579-2121.
 
                                        4
<PAGE>   19
 
                                USE OF PROCEEDS
 
     Unless otherwise indicated in the accompanying Prospectus Supplement, the
net proceeds received by the Company from the sale of any Debt Securities
(including Debt Securities sold to the Trust) or Common Stock offered hereby are
expected to be used for general corporate purposes, which may include investment
in insurance businesses and the repayment of outstanding debt of the Company and
its subsidiaries. Until the net proceeds are used for these purposes, the
Company may deposit them in interest-bearing accounts or invest them in
short-term marketable securities. The specific allocations, if any, of the
proceeds of any of the Securities will be described in the Prospectus Supplement
relating thereto.
 
     The proceeds from any sale of Preferred Securities by the Trust will be
invested in Debt Securities of the Company.
 
                       RATIO OF EARNINGS TO FIXED CHARGES
 
     The following table sets forth the historical ratios of earnings to fixed
charges for the Company and its subsidiaries. Fixed charges are computed on a
"total enterprise" basis. For purposes of calculating the ratios, "earnings"
have been computed by adding to pretax earnings (excluding discontinued
operations) the fixed charges and minority interest in earnings of subsidiaries
having fixed charges and deducting (adding) the undistributed equity in earnings
(losses) of investees. Fixed charges include interest (excluding annuity
benefits), amortization of debt discount and expense, preferred dividend
requirements of subsidiaries and a portion of rental expense deemed to represent
the interest factor.
 
<TABLE>
<CAPTION>
                                                 NINE MONTHS
                                                    ENDED
                                                  SEPTEMBER
                                                     30,               YEAR ENDED DECEMBER 31,
                                                 ------------    ------------------------------------
                                                 1997    1996    1996    1995    1994    1993    1992
                                                 ----    ----    ----    ----    ----    ----    ----
<S>                                              <C>     <C>     <C>     <C>     <C>     <C>     <C>
Historical ratio of earnings to fixed
  charges......................................  3.45    4.78    4.22    2.60    1.69    2.62    2.15
</TABLE>
 
                                        5
<PAGE>   20
 
                         DESCRIPTION OF DEBT SECURITIES
 
GENERAL
 
     The following description of the Debt Securities sets forth certain general
terms and provisions of the Debt Securities to which any Prospectus Supplement
may relate. The particular terms of the Debt Securities offered by any
Prospectus Supplement and the extent, if any, to which such general provisions
do not apply to those Debt Securities will be described in the Prospectus
Supplement relating to such Debt Securities.
 
     The Debt Securities will be general unsecured obligations of the Company
and will constitute either senior debt securities or subordinated debt
securities. In the case of Debt Securities that will be senior debt securities
("Senior Debt Securities"), the Senior Debt Securities will be issued under an
Indenture (the "Senior Indenture") to be executed by the Company and Star Bank,
N.A., Cincinnati, Ohio, as trustee (the "Senior Debt Trustee"). In the case of
Debt Securities that will be subordinated debt securities ("Subordinated Debt
Securities"), the Debt Securities will be issued under an Indenture (the
"Subordinated Indenture") to be executed by the Company and The Bank of New
York, as trustee (the "Subordinated Debt Trustee") under the Subordinated
Indenture. Subordinated Debt Securities, if issued, will be initially issued to
the Trust in connection with an offering of Preferred Securities. The Senior
Debt Trustee and the Subordinated Debt Trustee are sometimes referred to herein
individually as the "Trustee" or collectively as the "Trustees." The Senior
Indenture and the Subordinated Indenture, as each may be amended or supplemented
from time to time, are sometimes referred to herein individually as the
"Indenture" or collectively as the "Indentures". The statements made under this
caption relating to the Debt Securities and the Indentures are summaries only,
do not purport to be complete, and are qualified in their entirety by reference
to the form of Indenture and the terms of the Debt Securities filed with the
Commission. Such summaries make use of terms defined in the Indentures. Wherever
such terms are used herein, such terms are incorporated by reference from the
Indentures as part of the statements made herein. Summaries of certain terms
used herein will be included in the Prospectus Supplement relating to the
issuance of any particular series of Debt Securities.
 
     Except as may be set forth in the terms of the Debt Securities and
described in the Prospectus Supplement relating to such Debt Securities, the
Indentures do not limit the amount of Debt Securities which can be issued
thereunder and provide that additional Debt Securities may be issued thereunder
up to the aggregate principal amount which may be authorized from time to time
by the Company's Board of Directors. Reference is made to the Prospectus
Supplement for the following terms of the particular series of Debt Securities
being offered thereby: (i) the title of the Debt Securities; (ii) the aggregate
principal amount and authorized denominations of the offering; (iii) the price
at which the Debt Securities will be issued; (iv) the date or dates on which the
Debt Securities will mature (or manner of determining the same); (v) the rate or
rates per annum, if any, at which the Debt Securities will bear interest (or the
manner of calculation thereof) and the date or dates from which such interest
will accrue; (vi) certain covenants which will be applicable to the offered Debt
Securities; (vii) the times at which any interest will be payable (or manner of
determining the same) and the Regular Record Dates for Interest Payment Dates;
(viii) the place or places where the principal of (and premium, if any) and
interest, if any, on the Debt Securities will be payable and each office or
agency, as described below under "Denominations, Registration and Transfer,"
where the Debt Securities may be presented for transfer or exchange; (ix) any
mandatory or optional sinking fund or analogous provisions; (x) the date, if
any, after which, and the price at which, such Debt Securities are payable
pursuant to any optional or mandatory redemption provisions; (xi) the terms and
conditions upon which the Debt Securities may be repayable prior to maturity at
the option of the holder thereof and the price at which such Debt Securities are
so repayable; (xii) any provisions regarding exchangeability or conversion of
the Debt Securities; (xiii) information with respect to book-entry procedures,
if any; (xiv) whether the Debt Securities are Senior Debt Securities or
Subordinated Debt Securities; and (xv) any other additional provisions or
specific terms which may be applicable to such Debt Securities.
 
     Some of the Debt Securities may be issued as discounted Debt Securities
(bearing no interest or interest at a rate which at the time of issuance is
below market rates) to be sold at a substantial discount below their stated
principal amount. Federal income tax consequences and other special
considerations applicable to any Discounted Debt Securities will be described in
the Prospectus Supplement relating thereto.
 
                                        6
<PAGE>   21
 
     Neither the Senior Indenture nor the Subordinated Indenture contain
provisions that afford the holders of the Senior Debt Securities or Subordinated
Debt Securities protection in the event of a highly leveraged transaction
involving the Company or other similar transaction that may adversely affect
such holders.
 
PROVISIONS APPLICABLE TO THE SENIOR DEBT SECURITIES
 
     DENOMINATIONS, REGISTRATION AND TRANSFER. Unless otherwise indicated in the
applicable Prospectus Supplement, the Senior Debt Securities of a series will be
issuable only in fully registered form. Unless otherwise provided in an
applicable Prospectus Supplement with respect to a series of Senior Debt
Securities, Senior Debt Securities will be issued only in denominations of
$1,000 or any integral multiple thereof.
 
     Senior Debt Securities may be presented for exchange or for registration of
transfer (with the form of transfer duly executed) at the office of a transfer
agent designated by the Company for such purpose with respect to any series of
Senior Debt Securities. If a Prospectus Supplement refers to any transfer agent
initially designated by the Company with respect to any series of Senior Debt
Securities, the Company may at any time rescind the designation of any such
transfer agent or approve a change in the location through which any such
transfer agent acts.
 
     The Company is not required to issue, register the transfer of, or exchange
Senior Debt Securities of any series for the 15-day period prior to the mailing
of a notice of redemption and, with respect to any Senior Debt Securities called
for redemption in whole or in part (except for the unredeemed portion of any
Senior Debt Securities being redeemed in part), following such mailing.
 
     PAYMENT AND PAYING AGENTS. Unless otherwise indicated in an applicable
Prospectus Supplement, payment of principal of (and premium, if any) and
interest, if any, on Senior Debt Securities will be made (i) by check mailed or
delivered to the address of the Person entitled thereto as such address shall
appear in the Debt Security Register or (ii) by wire transfer to an account
(with a bank located inside the United States) designated by the Person entitled
thereto. Unless otherwise indicated in an applicable Prospectus Supplement,
payment of any installment of interest on any Debt Security will be made to the
Person in whose name such Debt Security is registered at the close of business
on the Regular Record Date for such interest payment.
 
     All moneys paid by the Company to the Senior Debt Trustee or a Paying Agent
for the payment of principal of (and premium, if any) and interest, if any, on
any Debt Security which remains unclaimed at the end of two years after such
principal, premium or interest shall have become due and payable may be repaid
to the Company and the holder of such Debt Security will thereafter look only to
the Company for payment thereof.
 
     CONSOLIDATION, MERGER AND TRANSFER OF ASSETS. Under the Senior Indenture,
the Company may not consolidate with or merge into any other entity or sell,
convey, assign, transfer, lease or otherwise dispose of all or substantially all
of its properties and assets to any entity, unless: (1) either (a) the Company
shall be the continuing corporation or (b) the entity (if other than the
Company) formed by such consolidation or into which the Company is merged or the
entity that acquires, by sale, assignment, conveyance, transfer, lease or
disposition, all or substantially all of the properties and assets of the
Company as an entirety shall be a corporation, partnership or trust organized
and validly existing under the laws of the United States or any State thereof or
the District of Columbia, and shall expressly assume by a supplemental
indenture, the due and punctual payment of the principal of and premium, if any,
and interest on all the Senior Debt Securities and the performance and
observance of every covenant of the Senior Indenture on the part of the Company
to be performed or observed; (2) immediately thereafter, no Event of Default
(and no event that, after notice or lapse of time, or both, would become an
Event of Default) shall have occurred and be continuing; and (3) certain other
conditions, if any, are met, as are described in the Prospectus Supplement
relating to the Senior Debt Securities being offered thereby.
 
     In the event of any transaction (other than a lease) described in and
complying with the conditions listed in the immediately preceding paragraphs in
which the Company is not the continuing corporation, the successor entity formed
or remaining would be substituted for the Company and the Company would be
discharged from all obligations and covenants under the Senior Indenture and the
Senior Debt Securities.
 
                                        7
<PAGE>   22
 
     EVENTS OF DEFAULT. Unless otherwise set forth in the applicable Prospectus
Supplement and Indenture, the following events will constitute "Events of
Default" with respect to a series of Senior Debt Securities: (i) default in the
payment of any installment of interest on any Senior Debt Securities in such
series for 30 consecutive days after becoming due; (ii) default in the payment
of the principal of (or premium, if any, on) any Senior Debt Securities in such
series when due; (iii) default in the performance of any other covenant or
warranty applicable to such series contained in the Senior Debt Securities or
the Senior Indenture for a period of 60 days after written notice of such
failure, requiring the Company to remedy the same, shall have been given to the
Company by the Senior Debt Trustee or to the Company and the Senior Debt Trustee
by the holders of 25% in aggregate principal amount of such series of Senior
Debt Securities then Outstanding; (iv) default shall have occurred under any
other series of Senior Debt Securities or any agreements, indentures or
instruments under which the Company then has outstanding Indebtedness in excess
of $10 million in the aggregate and, if not already matured in accordance with
its terms, such Indebtedness shall have been accelerated and such acceleration
shall not have been rescinded or annulled within ten days after notice thereof
shall have been given to the Company by the Senior Debt Trustee or to the
Company and the Senior Debt Trustee by the holders of at least 25% in aggregate
principal amount of such series of Senior Debt Securities then Outstanding,
provided, that if, prior to the entry of judgment in favor of the Senior Debt
Trustee, such default under such Senior Indenture or instrument shall be
remedied or cured by the Company, or waived by the holders of such Indebtedness,
then the Event of Default under such Senior Indenture shall be deemed likewise
to have been remedied, cured or waived and provided, further, that if such
default results from an action of the United States government or a foreign
government which prevents the Company from performing its obligations under such
agreement, indenture or instrument, the occurrence of such default will not be
an Event of Default under such Senior Indenture; (v) one or more judgments,
orders or decrees for the payment of money in excess of $10 million, either
individually or in the aggregate, shall be entered against the Company and shall
not be discharged, there shall have been a period of 60 days during which a stay
of enforcement of such judgment or order, by reason of an appeal or otherwise,
shall not be in effect and there shall have been given written notice of the
default to the Company by the Senior Debt Trustee or to the Company and the
Senior Debt Trustee by the holders of 25% in aggregate principal amount of such
series of Senior Debt Securities then Outstanding; or (vi) certain events of
bankruptcy, insolvency or reorganization with respect to the Company shall have
occurred. If an Event of Default shall occur and be continuing with respect to a
series of Senior Debt Securities, either the Senior Debt Trustee or the holders
of at least 25% in principal amount of the Outstanding Senior Debt Securities of
such series may declare the entire principal amount, or, in the case of
Discounted Securities, such lesser amount as may be provided for in such
Discounted Securities, of all the Senior Debt Securities of such series to be
immediately due and payable.
 
     Under the Senior Indenture, the Company is required to furnish the Senior
Debt Trustee annually a statement by certain officers of the Company to the
effect that to the best of their knowledge the Company is not in default in the
fulfillment of any of its obligations under the Senior Indenture or, if there
has been a default in the fulfillment of any such obligation, specifying each
such default.
 
     The Senior Indenture provides that the Senior Debt Trustee shall, within 90
days after the occurrence of a default with respect to a particular series of
Senior Debt Securities (unless such default has been cured or waived), give the
holders of the Senior Debt Securities of such series notice of such default
known to it (the term default to mean the events specified above without grace
periods); provided that, except in the case of a default in the payment of
principal of (or premium, if any) or interest, if any, on any of the Senior Debt
Securities of such series, the Senior Debt Trustee shall be protected in
withholding such notice if it in good faith determines the withholding of such
notice is in the interest of the holders of the Senior Debt Securities of such
series.
 
     The holders of a majority in principal amount of a particular series of
Senior Debt Securities Outstanding have the right, subject to certain
limitations, to direct the time, method and place of conducting any proceeding
for any remedy available to the Senior Debt Trustee with respect to such series
or exercising any trust or power conferred on the Senior Debt Trustee, and to
waive certain defaults. The Senior Indenture provides that in case an Event of
Default shall occur and be continuing, the Senior Debt Trustee shall exercise
such of its rights and powers under the Senior Indenture, and use the same
degree of care and skill in its exercise, as a prudent person would exercise or
use under the circumstances in the conduct of his or her own affairs. Subject to
such provisions, the Senior Debt Trustee will be under no obligation to exercise
any of its rights or powers under the Senior
 
                                        8
<PAGE>   23
 
Indenture at the request of any of the holders of the Senior Debt Securities
unless they shall have offered to the Senior Debt Trustee reasonable security or
indemnity against the costs, expenses and liabilities which might be incurred by
it in compliance with such request.
 
     SATISFACTION AND DISCHARGE. Except as may otherwise be set forth in the
Prospectus Supplement relating to a series of Senior Debt Securities, the Senior
Indenture provides that the Company shall be deemed to have satisfied and
discharged its obligations under the Senior Debt Securities of such series (with
certain exceptions) at any time prior to the Stated Maturity or redemption
thereof when (a) the Company has deposited with the Senior Debt Trustee, in
trust, sufficient funds to pay the principal of (and premium, if any) and
interest, if any, to Stated Maturity (or to Redemption Date) on, the Senior Debt
Securities of such series, (b) the Company has paid all other sums payable with
respect to the Senior Debt Securities of such series and (c) certain other
conditions are met. Upon such discharge, the holders of the Senior Debt
Securities of such series shall no longer be entitled to the benefits of the
Senior Indenture, except for certain rights, including registration of transfer
and exchange of the Senior Debt Securities of such series and replacement of
mutilated, destroyed, lost or stolen Senior Debt Securities, and shall look only
to such deposited funds.
 
     Such discharge may be treated as a taxable exchange of the related Senior
Debt Securities for an issue of obligations of the trust or a direct interest in
the cash and securities held in the trust. In that case, holders of such Senior
Debt Securities would recognize gain or loss as if the trust obligations or the
cash or securities deposited, as the case may be, had actually been received by
them in exchange for their Senior Debt Securities. Such holders thereafter might
be required to include in income a different amount than would be includable in
the absence of discharge. Prospective investors are urged to consult their own
tax advisors as to the specific consequences of discharge.
 
     MODIFICATION AND WAIVER. Certain modifications and amendments (which,
generally, either benefit or do not affect the holders of Outstanding Senior
Debt Securities) of the Senior Indenture may be made by the Company and the
Senior Debt Trustee without the consent of holders of the Senior Debt
Securities. Other modifications and amendments of each Senior Indenture require
the consent of the holders of more than 50% in principal amount of the
Outstanding Senior Debt Securities of each series issued under the Senior
Indenture affected by the modification or amendment; provided, however, that no
such modification or amendment may, without the consent of the holder of each
Outstanding Senior Debt Security affected thereby, (a) change the Stated
Maturity of the principal of, or any installment of principal of or interest, if
any, on any Senior Debt Security, (b) reduce the principal amount of (or
premium, if any) or interest, if any, on any Senior Debt Security, (c) reduce
the amount of principal of a Discounted Senior Debt Security payable upon
acceleration of the Maturity thereof, (d) impair the right to institute suit for
the enforcement of any payment on or with respect to any Senior Debt Security on
or after the Stated Maturity thereof (or, in the case of redemption, on or after
the Redemption Date) or (e) reduce the percentage in principal amount of
Outstanding Senior Debt Securities of any series, the consent of the holders of
which is required for modification or amendment of such Senior Indenture or for
waiver of compliance with certain provisions of such Senior Indenture or for
waiver of certain defaults.
 
     The holders of a majority in principal amount of the Outstanding Senior
Debt Securities of any series may on behalf of the holders of all Senior Debt
Securities of that series waive, insofar as that series is concerned, compliance
by the Company with certain restrictive provisions of the Senior Indenture. The
holders of a majority in principal amount of the Outstanding Senior Debt
Securities of any series may on behalf of the holders of all Senior Debt
Securities of that series waive any past default under the Senior Indenture with
respect to that series, except a default in the payment of the principal of (or
premium, if any) and interest, if any, on any Debt Security of that series or in
respect of a provision which under the Senior Indenture cannot be modified or
amended without the consent of the holder of each Outstanding Debt Security of
that series affected.
 
PROVISIONS APPLICABLE TO THE SUBORDINATED DEBT SECURITIES
 
     DENOMINATIONS, REGISTRATION AND TRANSFER. If Subordinated Debt Securities
are distributed to holders of Preferred Securities in liquidation of such
holders' interests in the Trust, it is presently anticipated that such
Subordinated Debt Securities will initially be issued in the form of one or more
Global Securities (as defined below). As described herein, under certain limited
circumstances, Subordinated Debt Securities may be issued in
 
                                        9
<PAGE>   24
 
definitive certificated form in exchange for a Global Security. See
"-- Book-Entry and Settlement" below. Payments on Subordinated Debt Securities
issued as a Global Security will be made to DTC or its nominee, a successor
depository or its nominee. In the event Subordinated Debt Securities are issued
in definitive certificated form, principal and interest will be payable, the
transfer of the Subordinated Debt Securities will be registrable and
Subordinated Debt Securities will be exchangeable for Subordinated Debt
Securities of other denominations of a like aggregate principal amount at the
principal corporate trust office of the Subordinated Debt Trustee in New York,
New York; provided that payment of interest may be made at the option of the
Company by check mailed to the address of the persons entitled thereto.
 
     SUBORDINATION. The Subordinated Indenture will provide that the
Subordinated Debt Securities are subordinated and junior in right of payment to
the prior payment in full of all Senior Indebtedness of the Company whether now
existing or hereafter incurred. In the event and during the continuation of any
default by the Company in the payment of principal, premium, interest or any
other payment due on any Senior Indebtedness of the Company, or in the event
that the maturity of any Senior Indebtedness of the Company has been accelerated
because of a default, then in either case, no payment will be made by the
Company with respect to the principal (including redemption payments) of or
interest on the Subordinated Debt Securities. Upon any distribution of assets of
the Company to creditors upon any dissolution, winding-up, liquidation or
reorganization, whether voluntary or involuntary, or in bankruptcy, insolvency,
receivership or other proceedings, all principal, premium, if any, and interest
due or to become due on all Senior Indebtedness of the Company (including
interest after the commencement of any bankruptcy, insolvency, receivership or
other proceedings at the rate specified in the applicable Senior Indebtedness,
whether or not such interest is an allowable claim in any such proceeding) must
be paid in full before the holders of Subordinated Debt Securities are entitled
to receive or retain any payment. In the event that the Subordinated Debt
Securities are declared due and payable before the Maturity Date, then all
amounts due or to become due on all Senior Indebtedness shall have been paid in
full (including interest after the commencement of any bankruptcy, insolvency,
receivership or other proceedings at the rate specified in the applicable Senior
Indebtedness, whether or not such interest is an allowable claim in any such
proceeding) before holders of the Subordinated Debt Securities are entitled to
receive or retain any payment. Upon satisfaction of all claims of all Senior
Indebtedness then outstanding, the rights of the holders of the Subordinated
Debt Securities will be subrogated to the rights of the holders of Senior
Indebtedness of the Company to receive payments or distributions applicable to
Senior Indebtedness until all amounts owing on the Subordinated Debt Securities
are paid in full.
 
     The term "Senior Indebtedness" means, with respect to the Company, (i) the
principal, premium, if any, and interest in respect of (A) indebtedness of the
Company for money borrowed and (B) indebtedness evidenced by securities,
debentures, bonds or other similar instruments issued by the Company; (ii) all
capital lease obligations of the Company; (iii) all obligations of the Company
issued or assumed as the deferred purchase price of property, all conditional
sale obligations of the Company and all obligations of the Company under any
title retention agreement (but excluding trade accounts payable arising in the
ordinary course of business); (iv) all obligations of the Company for the
reimbursement on any letter of credit, banker's acceptance, security purchase
facility or similar credit transaction; (v) all obligations of the type referred
to in clauses (i) through (iv) above of other persons for the payment of which
the Company is responsible or liable as obligor, guarantor or otherwise,
including under all support agreements or guarantees by the Company of
debentures, notes and other securities issued by its subsidiaries; and (vi) all
obligations of the type referred to in clauses (i) through (v) above of other
persons secured by any lien on any property or asset of the Company (whether or
not such obligation is assumed by the Company); except in each case for (1) any
such indebtedness that is by its terms subordinated to or pari passu with the
Subordinated Debt Securities, and (2) any indebtedness in respect of debt
securities issued to any trust, or a trustee of such trust, partnership or other
entity affiliated with the Company that is a financing entity of the Company (a
"financing entity") in connection with the issuance by such financing entity of
securities that are similar to the Preferred Securities. Such Senior
Indebtedness shall continue to be Senior Indebtedness and be entitled to the
benefits of the subordination provisions irrespective of any amendment,
modification or waiver of any term of such Senior Indebtedness.
 
     The Subordinated Indenture does not limit the aggregate amount of Senior
Indebtedness that may be issued by the Company.
 
                                       10
<PAGE>   25
 
     OPTION TO CHANGE SCHEDULED MATURITY DATE. The Company may extend the
scheduled maturity date for one or more periods. The Company must satisfy the
following conditions on the date the Company exercises such right and on the
Maturity Date then in effect prior to such proposed extension: (a) the Company
is not in bankruptcy or otherwise insolvent, (b) the Company is not in default
on any Subordinated Debt Securities issued to the Trust or to any trustee of the
Trust in connection with an issuance of Trust Securities by the Trust, (c) the
Company has made timely payments on the Subordinated Debt Securities for the
immediately preceding six quarters without deferrals, (d) the Trust is not in
arrears on payments of distributions on the Trust Securities, (e) the
Subordinated Debt Securities or Preferred Securities are rated investment grade
by any one of Standard & Poor's Corporation, Moody's Investors Service, Inc.,
Fitch Investor Services, Duff & Phelps Credit Rating Company or any other
nationally recognized statistical rating organization, and (f) the final
maturity of such Subordinated Debt Securities is not later than the 49th
anniversary of the issuance of the Preferred Securities. Pursuant to the
Declaration, the Regular Trustees are required to give notice of the Company's
election to change the Maturity Date to the holders of the Preferred Securities.
 
     OPTION TO EXTEND INTEREST PAYMENT PERIOD. The Company has the right, from
time to time, to defer payment of interest on the Subordinated Debt Securities
for up to 20 consecutive quarters, provided that no Extension Period may extend
beyond the Maturity Date of the Subordinated Debt Securities. There could be
multiple Extension Periods of varying lengths during the term of the
Subordinated Debt Securities. At the end of each Extension Period, if any, the
Company shall pay all interest then accrued and unpaid, together with interest
thereon, compounded quarterly at the rate specified for the Subordinated Debt
Securities to the extent permitted by applicable law ("Compound Interest"). In
the event the Company exercises this right, then during any Extension Period,
(a) the Company shall not declare or pay any dividends on, make any distribution
with respect to, or redeem, purchase, acquire or make a liquidation payment with
respect to any of its capital stock and (b) the Company shall not, directly or
indirectly, and will not allow any of its subsidiaries to, make any payment of
interest, principal or premium, if any, on or repay, repurchase or redeem any
debt securities issued by the Company that rank pari passu with or junior to the
Subordinated Debt Securities; provided, however, that, the restriction in clause
(a) above does not apply (i) to repurchases or acquisitions of shares of common
stock of the Company as contemplated by any employment arrangement, benefit plan
or other similar contract with or for the benefit of employees, officers or
directors entered into in the ordinary course of business, (ii) as a result of
an exchange or conversion of any class or series of the Company's capital stock
for common stock, (iii) to the purchase of fractional interests in shares of the
Company's capital stock pursuant to the conversion or exchange provisions of
such capital stock or the security being converted or exchanged or (iv) to the
payment of any stock dividend by the Company payable in common stock. Prior to
the termination of any such Extension Period, the Company may further defer
payments of interest by extending the interest payment period; provided,
however, that each Extension Period, including all such previous and further
extensions if any, may not exceed 20 consecutive quarters or extend beyond the
Maturity Date. Upon the termination of any Extension Period and the payment of
all amounts then due, the Company may commence a new Extension Period, subject
to the terms set forth in this section. No interest during an Extension Period,
except at the end thereof, shall be due and payable.
 
     COVENANTS RELATING TO THE TRUST. The Subordinated Indenture requires that
for so long as the Preferred Securities and the Common Securities remain
outstanding, the Company will be required to (i) maintain 100% of direct or
indirect ownership of the Common Securities, provided, however, that any
permitted successor of the Company under the Subordinated Indenture may succeed
to the Company's ownership of the Common Securities, (ii) not voluntarily
dissolve, wind-up or terminate the Trust, except in connection with the
distribution of Subordinated Debt Securities or certain mergers, consolidations
or amalgamations, each as permitted by the Declaration, (iii) timely perform its
duties as sponsor of the Trust, (iv) use its reasonable efforts to cause the
Trust (a) to remain a business trust classified as a grantor trust, except in
connection with a distribution of the Subordinated Debt Securities to the
holders of Preferred Securities in liquidation of the Trust, the redemption of
all of the Preferred Securities and Common Securities of the Trust or certain
mergers, consolidations or amalgamations, each as permitted by the Declaration,
and (b) continue not to be treated as an association taxable as a corporation
for United States federal income tax purposes other than in connection with a
distribution of the Subordinated Debt Securities to the holders of Preferred
Securities in liquidation of the Trust, and (v) use its
 
                                       11
<PAGE>   26
 
reasonable efforts to cause each holder of Preferred Securities and Common
Securities to be treated as owning an undivided beneficial interest in the
Subordinated Debt Securities.
 
     CONSOLIDATION, MERGER AND TRANSFER OF ASSETS. Upon any consolidation of the
Company with, or merger of the Company into, any other person or any conveyance,
transfer or lease of the properties and assets of the Company substantially as
an entirety, the successor person formed by such consolidation or into which the
Company is merged or to which such conveyance, transfer or lease is made shall
succeed to, and be substituted for, and may exercise every right and power of,
the Company under the Subordinated Indenture with the same effect as the Company
prior to such transaction, and thereafter, except in the case of a lease, the
Company shall be relieved of all obligations and covenants under the
Subordinated Indenture and the Subordinated Debt Securities.
 
     EVENTS OF DEFAULT. The occurrence of any of the following events with
respect to the Subordinated Debt Securities will, unless otherwise specified,
constitute an "Event of Default" with respect to the Subordinated Debt
Securities: (i) default for thirty (30) days in the payment of any installment
of interest on the Subordinated Debt Securities; (ii) default in the payment of
any of the principal of the Subordinated Debt Securities when due, whether at
maturity, upon redemption, by declaration of acceleration or otherwise; (iii)
default for sixty (60) days by the Company in the observance or performance of
any other covenant or agreement contained in the Subordinated Debt Securities or
the Subordinated Indenture (other than a covenant or agreement default which is
specifically designated as having a different time period) for the benefit of
the Subordinated Debt Securities after written notice thereof as provided in the
Subordinated Indenture; (iv) (a) an event of default occurs under any instrument
(including the Subordinated Indenture) under which there is at the time
outstanding, or by which there may be secured or evidenced, any indebtedness of
the Company for money borrowed by the Company (other than non-recourse
indebtedness) which results in acceleration or nonpayment at maturity (after
giving effect to any applicable grace period) of such indebtedness in an
aggregate amount exceeding $15 million, or any such indebtedness exceeding $15
million shall otherwise be declared to be due and payable, or required to be
prepaid (other than by a regularly scheduled prepayment or exercise of an
optional prepayment right), prior to the stated maturity thereof, or any failure
by the Company to make any payment under a guarantee in respect of any
indebtedness, in each case in an amount of at least $15 million, on the date
such payment is due (or within any grace period specified in the agreement or
other instrument governing such indebtedness); in which case the Company shall
immediately give notice to the Trustee of such acceleration or non-payment, and
(b) there shall have been a failure to cure such default or to pay or discharge
such defaulted indebtedness within ten (10) days after written notice thereof as
provided in the Subordinated Indenture; (v) any final non-appealable judgment or
order for the payment of money in excess of $15 million is rendered against the
Company, such judgment or order is not satisfied by payment or bonded and either
enforcement proceedings have been commenced by the judgment creditor or there
has been a period of 60 consecutive days during which a stay of enforcement of
such judgment or order, by reason of a pending appeal or otherwise, shall not
have been in effect; provided, however, that a judgment or order fully covered
by insurance (or a judgment or order for the payment of money covered by
insurance to the extent of all payments in excess of $15 million), which
coverage has not been disputed by the insurer, shall not be considered a default
or an Event of Default; or (vi) certain events of bankruptcy, insolvency or
reorganization relating to the Company.
 
     In addition, an Event of Default shall include the voluntary or involuntary
dissolution or winding up of the business of the Trust or other termination of
the existence of the Trust, other than in connection with (i) the distribution
of the Subordinated Debt Securities to holders of the Trust Securities in
liquidation of their interests in the Trust, (ii) the redemption of all of the
outstanding Trust Securities, or (iii) certain mergers, consolidations or
amalgamations of the Trust, each as permitted by the Declaration.
 
     If any Event of Default shall occur and be continuing, the Property
Trustee, as the holder of the Subordinated Debt Securities, will have the right
to declare the principal of and the interest on the Subordinated Debt Securities
(including any Compound Interest and any other amounts payable under the
Subordinated Indenture) to be forthwith due and payable and to enforce its other
rights as a creditor with respect to the Subordinated Debt Securities subject to
the subordination provisions in the Subordinated Indenture. An Event of Default
also constitutes a Declaration Event of Default. If the Property Trustee fails
to enforce its rights with
 
                                       12
<PAGE>   27
 
respect to the Subordinated Debt Securities held by the Trust, any record holder
of Preferred Securities may institute legal proceedings directly against the
Company to enforce the Property Trustee's rights under such Subordinated Debt
Securities without first instituting any legal proceedings against such Property
Trustee or any other person or entity. In addition, if a Declaration Event of
Default has occurred and is continuing and such event is attributable to the
failure of the Company to pay interest or principal on the Subordinated Debt
Securities issued to the Trust on the date such interest or principal is
otherwise payable, then a record holder of Preferred Securities may institute a
proceeding directly against the Company for enforcement of payment to the record
holder of the Preferred Securities of the principal of or interest on the
Subordinated Debt Securities on or after the respective due dates specified in
the Subordinated Debt Securities, and the amount of the payment will be based on
the holder's pro rata share of the amount due and owing on all of the Preferred
Securities. The record holder in the case of the issuance of one or more global
Preferred Securities certificates will be DTC acting at the direction of its
Direct Participants, who in turn will be acting at the direction of the
Beneficial Owners. The holders of Preferred Securities in certain circumstances
have the right to direct the Property Trustee to exercise its rights, with
respect to other than principal and interest payments on the Subordinated Debt
Securities, as the holder of the Subordinated Debt Securities. See "Description
of the Preferred Securities -- Declaration Events of Default" and "Description
of the Preferred Securities -- Voting Rights."
 
     SATISFACTION AND DISCHARGE. Except as may otherwise be set forth in the
Prospectus Supplement relating to Subordinated Debt Securities, the Subordinated
Indenture provides that the Company shall be deemed to have satisfied and
discharged its obligations under the Subordinated Debt Securities (with certain
exceptions) at any time prior to the final maturity or redemption thereof when
(a) the Company has deposited with the Subordinated Debt Trustee, in trust,
sufficient funds to pay the principal of (and premium, if any) and interest, if
any, to maturity (or to Redemption Date) on, the Subordinated Debt Securities,
(b) the Company has paid all other sums payable with respect to the Subordinated
Debt Securities and (c) certain other conditions are met. Upon such discharge,
the holders of the Subordinated Debt Securities of such series shall no longer
be entitled to the benefits of the Subordinated Indenture, except for certain
rights, including registration of transfer and exchange of the Subordinated Debt
Securities of such series and replacement of mutilated, destroyed, lost or
stolen Subordinated Debt Securities, and shall look only to such deposited
funds.
 
     Such discharge may be treated as a taxable exchange of the related
Subordinated Debt Securities for an issue of obligations of the trust or a
direct interest in the cash and securities held in the trust referred to in the
prior paragraph. In that case, holders of such Subordinated Debt Securities
would recognize gain or loss as if the trust obligations or the cash or
securities deposited, as the case may be, had actually been received by them in
exchange for their Subordinated Debt Securities. Such holders thereafter might
be required to include in income a different amount than would be includable in
the absence of discharge. Prospective investors are urged to consult their own
tax advisors as to the specific consequences of discharge.
 
     MODIFICATION AND WAIVER. Certain modifications and amendments (which,
generally, either benefit or do not affect the holders of Subordinated Debt
Securities) of the Subordinated Indenture may be made by the Company and the
Subordinated Debt Trustee without the consent of holders of the Subordinated
Debt Securities. Other modifications and amendments of each Subordinated
Debenture require the consent of the holders of more than 50% in principal
amount of the Subordinated Debt Securities issued under the Subordinated
Indenture affected by the modification or amendment; provided, however, that no
such modification or amendment may, without the consent of the holder of each
Subordinated Debt Security affected thereby, (a) change the Stated Maturity of
the principal of, or any installment of principal of or interest, if any, on any
Subordinated Debt Security, (b) reduce the principal amount of (or premium, if
any) or interest, if any, on any Subordinated Debt Security, (c) reduce the
amount of principal of a Subordinated Debt Security payable upon acceleration of
the Maturity thereof, (d) impair the right to institute suit for the enforcement
of any payment on or with respect to any Subordinated Debt Security on or after
the Stated Maturity thereof (or, in the case of redemption, on or after the
Redemption Date) or (e) reduce the percentage in principal amount of Outstanding
Senior Debt Securities of any series, the consent of the holders of which is
required for modification or amendment of such Senior Indenture or for waiver of
compliance with certain provisions of such Senior Indenture or for waiver of
certain defaults.
 
                                       13
<PAGE>   28
 
     The holders of a majority in principal amount of the Subordinated Debt
Securities may on behalf of the holders of all Subordinated Debt Securities
waive compliance by the Company with certain restrictive provisions of the
Subordinated Indenture. The holders of a majority in principal amount of the
Subordinated Debt Securities may on behalf of the holders of all Subordinated
Debt Securities waive any past default under the Subordinated Indenture, except
a default in the payment of the principal of (or premium, if any) and interest,
if any, on any Subordinated Debt Security or in respect of a provision which
under the Subordinated Indenture cannot be modified or amended without the
consent of the holder of each Subordinated Debt Security affected; provided,
however, that no waiver of any past default or compliance with any covenant
shall be effective without the prior consent of the holders of at least a
majority of the aggregate liquidation preference of the outstanding Preferred
Securities unless the principal of and any premium on the Subordinated Debt
Securities and all accrued and unpaid interest thereon has been paid in full.
 
                          DESCRIPTION OF COMMON STOCK
 
     AFG is incorporated under the laws of the State of Ohio. The following
description is a summary and is qualified in its entirety by the provisions of
AFG's Articles of Incorporation, Code of Regulations and the Ohio General
Corporation Law.
 
     The total number of authorized shares of Common Stock is 200,000,000.
Holders of Common Stock are entitled to one vote for each share held of record
on all matters submitted to a vote of shareholders. Holders of Common Stock have
the right to cumulate their votes in the election of directors but are not
entitled to any preemptive rights.
 
     Subject to preferences which may be granted to holders of preferred stock,
holders of Common Stock are entitled to such dividends as the Board of
Directors, in its discretion, may validly declare from funds legally available.
In the event of liquidation, each outstanding share of Common Stock entitles its
holder to participate ratably in the assets remaining after the payment of
liabilities and any preferred stock liquidation preferences.
 
     AFG is authorized to issue 12,500,000 shares of voting preferred stock and
12,500,000 shares of nonvoting preferred stock, each without par value, none of
which is outstanding. AFG's Articles of Incorporation authorize the Board of
Directors, without further shareholder approval, to designate for any series of
preferred stock not fixed in AFG's Articles of Incorporation the designations,
preferences, conversion rights, and relative, participating, optional and other
special rights, and such qualifications, limitations or restrictions, as they
determine and as are permitted by the Ohio General Corporation Law.
 
     AFG's stock option plan allows for the grant of options for shares of
Common Stock at a price not less than the fair market value of the underlying
Common Stock at the date of grant. Options granted to officers and key employees
become exercisable at the rate of 20% per year commencing one year after grant;
those granted to non-employee directors of AFG are fully exercisable upon grant.
All options expire ten years after the date of grant. At December 31, 1996,
there were 5.4 million shares of Common Stock reserved for issuance upon
exercise of the options and 3.3 million options outstanding.
 
     The affirmative vote of the holders of a majority of the outstanding shares
of Common Stock is required to amend the Articles of Incorporation and to
approve mergers, reorganizations, share exchanges and similar transactions.
 
     The Company acts as its own transfer agent and registrar.
 
                DESCRIPTION OF PREFERRED SECURITIES OF THE TRUST
 
     The following summary of certain provisions of the Declaration of Trust of
the Trust (the "Declaration") does not purport to be complete and is subject to
and qualified in its entirety by reference to the Declaration, a copy of which
has been filed with the Commission.
 
     The Trust may issue a series of Preferred Securities having terms described
in the Prospectus Supplement relating thereto. The Declaration authorizes the
Regular Trustees of the Trust to issue on behalf of the Trust one series of
Preferred Securities. The Declaration will be qualified as an indenture under
the Trust Indenture Act. The Preferred Securities will have such terms,
including distributions, redemption, voting, liquidation rights and
 
                                       14
<PAGE>   29
 
such other preferred, deferred or other special rights or such restrictions as
shall be established by the Regular Trustees in accordance with the Declaration
or as shall be set forth in the Declaration or made part of the Declaration by
the Trust Indenture Act. Reference is made to any Prospectus Supplement relating
to the Preferred Securities of the Trust for specific terms of the Preferred
Securities, including, to the extent applicable, (i) the distinctive designation
of such Preferred Securities, (ii) the number of Preferred Securities issued by
the Trust, (iii) the annual distribution rate (or method of determining such
rate) for Preferred Securities issued by the Trust and the date or dates upon
which such distributions shall be payable (provided, however, that distributions
on such Preferred Securities shall, subject to any deferral provisions, and any
provisions for payment of defaulted distributions, be payable on a quarterly
basis to Holders of such Preferred Securities as of a record date in each
quarter during which such Preferred Securities are outstanding), (iv) any right
of the Trust to defer quarterly distributions on the Preferred Securities as a
result of an interest deferral right exercised by the Company on the Debt
Securities held by the Trust; (v) whether distributions on Preferred Securities
shall be cumulative, and, in the case of Preferred Securities having such
cumulative distribution rights, the date or dates or method of determining the
date or dates from which distributions on Preferred Securities shall be
cumulative, (vi) the amount or amounts which shall be paid out of the assets of
the Trust to the Holders of Preferred Securities upon voluntary or involuntary
dissolution, winding-up or termination of the Trust, (vii) the obligation or
option, if any, of the Trust to purchase or redeem Preferred Securities and the
price or prices at which, the period or periods within which and the terms and
conditions upon which Preferred Securities shall be purchased or redeemed, in
whole or in part, pursuant to such obligation or option, (viii) the voting
rights, if any, of Preferred Securities in addition to those required by law,
including the number of votes per Preferred Security and any requirement for the
approval by the Holders of Preferred Securities as a condition to specified
action or amendments to the Declaration, (ix) the terms and conditions, if any,
upon which Debt Securities held by the Trust may be distributed to holders of
Preferred Securities, and (x) any other relevant rights, preferences,
privileges, limitations or restrictions of Preferred Securities consistent with
the Declaration or with applicable law. All Preferred Securities offered hereby
will be guaranteed by the Company to the extent set forth below under
"Description of Trust Guarantee." Certain United States federal income tax
considerations applicable to any offering of Preferred Securities will be
described in the Prospectus Supplement relating thereto.
 
     The Declaration authorizes the Regular Trustees to issue on behalf of the
Trust one series of Common Securities having such terms including distributions,
redemption, voting, liquidation rights or such restrictions as shall be
established by the Regular Trustees in accordance with the Declaration or as
shall otherwise be set forth therein. The terms of the Common Securities issued
by the Trust will be substantially identical to the terms of the Preferred
Securities issued by the Trust, and the Common Securities will rank pari passu,
and payments will be made thereon pro rata, with the Preferred Securities except
that, if an event of default under the Declaration has occurred and is
continuing, the rights of the holders of the Common Securities to payment in
respect of distributions and payments upon liquidation, redemption and otherwise
will be subordinated to the rights of the holders of the Preferred Securities.
An event of default under the Declaration will be deemed to have occurred
whenever an event of default (as defined in the Indenture) shall have occurred
with respect to the Debt Securities held by the Trust. Except in certain limited
circumstances, the Common Securities will also carry the right to vote and to
appoint, remove or replace any of the Trustees of the Trust. All of the Common
Securities of the Trust will be directly or indirectly owned by the Company.
 
                         DESCRIPTION OF TRUST GUARANTEE
 
     Set forth below is a summary of information concerning the Trust Guarantee
that will be executed and delivered by the Company for the benefit of the
holders, from time to time, of Preferred Securities. The Trust Guarantee will be
qualified as an indenture under the Trust Indenture Act. The Bank of New York
will act as indenture trustee under the Trust Guarantee (the "Preferred
Securities Guarantee Trustee"). The terms of the Trust Guarantee will be those
set forth in such Trust Guarantee and those made part of such Trust Guarantee by
the Trust Indenture Act. The summary of certain provisions of the Trust
Guarantee does not purport to be complete and is subject to and qualified in its
entirety by reference to the provisions of the form of Trust Guarantee, a copy
of which has been filed as an exhibit to the Registration Statement of which
this Prospectus is a
 
                                       15
<PAGE>   30
 
part, and the Trust Indenture Act. The Trust Guarantee will be held by the
Preferred Securities Guarantee Trustee for the benefit of the holders of the
Preferred Securities of the Trust.
 
GENERAL
 
     Pursuant to the Trust Guarantee, the Company will irrevocably and
unconditionally agree, to the extent set forth therein, to pay in full to the
holders of the Preferred Securities, the Trust Guarantee Payments (as defined
below) (except to the extent paid by the Trust), as and when due, regardless of
any defense, right of set-off or counterclaim which the Trust may have or
assert. The following payments or distributions with respect to the Preferred
Securities (the "Trust Guarantee Payments"), to the extent not paid by the
Trust, will be subject to the Trust Guarantee (without duplication): (i) any
accrued and unpaid distributions that are required to be paid on such Preferred
Securities, to the extent the Trust shall have funds available therefor, (ii)
the redemption price, including all accrued and unpaid distributions to the date
of redemption (the "Redemption Price"), to the extent the Trust has funds
available therefor, with respect to any Preferred Securities called for
redemption by the Trust and (iii) upon a voluntary or involuntary dissolution,
winding-up or termination of the Trust (other than in connection with the
distribution of Debt Securities to the holders of Preferred Securities or the
redemption of all of the Preferred Securities upon maturity or redemption of the
Debt Securities) the lesser of (a) the aggregate of the liquidation amount and
all accrued and unpaid distributions on such Preferred Securities to the date of
payment, to the extent the Trust has funds available therefor or (b) the amount
of assets of the Trust remaining for distribution to holders of such Preferred
Securities in liquidation of the Trust. The Company's obligation to make a Trust
Guarantee Payment may be satisfied by direct payment of the required amounts by
the Company to the holders of Preferred Securities or by causing the Trust to
pay such amounts to such holders.
 
     The Trust Guarantee will be a full and unconditional guarantee with respect
to the Preferred Securities from the time of issuance of such Preferred
Securities but will not apply to any payment of distributions except to the
extent the Trust shall have funds available therefor. If the Company does not
make interest or principal payments on the Debt Securities purchased by the
Trust, the Trust will not pay distributions on the Preferred Securities issued
by the Trust and will not have funds available therefor.
 
     The Company has also agreed to irrevocably and unconditionally guarantee
the obligations of the Trust with respect to the Common Securities (the "Trust
Common Guarantee") to the same extent as the Trust Guarantee, except that, if an
Event of Default under the Indenture has occurred and is continuing, holders of
Preferred Securities under the Trust Guarantee shall have priority over holders
of the Common Securities under the Trust Common Guarantee with respect to
distributions and payments on liquidation, redemption or otherwise.
 
CERTAIN COVENANTS OF THE COMPANY
 
     In the Trust Guarantee, the Company will covenant that, so long as any
Preferred Securities remain outstanding, if there shall have occurred any event
of default under the Trust Guarantee or under the Declaration, then (a) the
Company will not declare or pay any dividend on, make any distributions with
respect to, or redeem, purchase, acquire or make a liquidation payment with
respect to, any of its capital stock; (b) the Company shall not make any payment
of interest, principal or premium, if any, on or repay, repurchase or redeem any
debt securities (including guarantees) issued by the Company which rank pari
passu with or junior to the Debt Securities issued to the Trust and (c) the
Company shall not make any guarantee payments with respect to the foregoing
(other than pursuant to the Trust Guarantee)provided, however, that the Company
may declare and pay a stock dividend where the dividend stock is the same stock
as that on which the dividend is being paid.
 
MODIFICATION OF THE TRUST GUARANTEES; ASSIGNMENT
 
     Except with respect to any changes that do not adversely affect the rights
of holders of Preferred Securities (in which case no consent of such holders
will be required), the Trust Guarantee may be amended only with the prior
approval of the holders of not less than a majority in liquidation amount of the
outstanding Preferred Securities. The manner of obtaining any such approval of
holders of such Preferred Securities will be set forth in an accompanying
Prospectus Supplement. All guarantees and agreements contained in the Trust
Guarantee shall
 
                                       16
<PAGE>   31
 
bind the successors, assigns, receivers, trustees and representatives of the
Company and shall inure to the benefit of the holders of the Preferred
Securities then outstanding.
 
EVENTS OF DEFAULT
 
     An event of default under the Trust Guarantee will occur upon the failure
of the Company to perform any of its payment or other obligations thereunder.
The holders of a majority in liquidation amount of the Preferred Securities have
the right to direct the time, method and place of conducting any proceeding for
any remedy available to the Preferred Securities Guarantee Trustee in respect of
the Trust Guarantee or to direct the exercise of any trust or power conferred
upon the Preferred Securities Guarantee Trustee under the Trust Guarantee.
 
     If the Preferred Securities Guarantee Trustee fails to enforce the Trust
Guarantee, any holder of Preferred Securities may institute a legal proceeding
directly against the Company to enforce its rights under the Trust Guarantee
without first instituting a legal proceeding against the Trust, the Preferred
Securities Guarantee Trustee or any other person or entity. The Company has
waived any right or remedy to require that any action be brought first against
the Trust or any other person or entity before proceeding directly against the
Company.
 
     The Company will be required to provide annually to the Preferred
Securities Guarantee Trustee a statement as to the performance by the Company of
certain of its obligations under the Trust Guarantee and as to any default in
such performance.
 
INFORMATION CONCERNING THE PREFERRED SECURITIES GUARANTEE TRUSTEE
 
     The Preferred Securities Guarantee Trustee, prior to the occurrence of a
default, undertakes to perform only such duties as are specifically set forth in
the Trust Guarantee and, after default with respect to the Trust Guarantee,
shall exercise the same degree of care as a prudent individual would exercise in
the conduct of his or her own affairs. Subject to such provision, the Preferred
Securities Guarantee Trustee is under no obligation to exercise any of the
powers vested in it by the Trust Guarantee at the request of any holder of
Preferred Securities unless it is offered reasonable indemnity against the
costs, expenses and liabilities that might be incurred thereby.
 
TERMINATION OF THE TRUST GUARANTEE
 
     The Trust Guarantee will terminate as to the Preferred Securities upon full
payment of the Redemption Price of all Preferred Securities, upon distribution
of the Debt Securities held by the Trust to the holders of all of the Preferred
Securities or upon full payment of the amounts payable in accordance with the
Declaration upon liquidation of the Trust. The Trust Guarantee will continue to
be effective or will be reinstated, as the case may be, if at any time any
holder of Preferred Securities must restore payment of any sums paid under such
Preferred Securities or the Trust Guarantee.
 
STATUS OF THE TRUST GUARANTEE
 
     The Trust Guarantee will constitute an unsecured obligation of the Company
and will rank (i) subordinate and junior in right of payment to all other
liabilities of the Company, including the Debt Securities, except those
liabilities of the Company made pari passu or subordinate by their terms, (ii)
pari passu with the most senior preferred or preference stock now or hereafter
issued by the Company and with any guarantee now or hereafter entered into by
the Company in respect of any preferred or preference stock of any affiliate of
the Company and (iii) senior to the Company's Common Stock. The terms of the
Preferred Securities provide that each holder of Preferred Securities by
acceptance thereof agrees to the subordination provisions and other terms of the
Trust Guarantee.
 
     The Trust Guarantee will constitute a guarantee of payment and not of
collection (that is, the guaranteed party may institute a legal proceeding
directly against the Company to enforce its rights under the Trust Guarantee
without instituting a legal proceeding against any other person or entity).
 
                                       17
<PAGE>   32
 
                              PLAN OF DISTRIBUTION
 
     The Company and the Trust may offer and sell Securities in any of the
following ways: (i) directly to purchasers, (ii) through agents, (iii) through
underwriters, (iv) through dealers or (v) through a combination of any such
methods. The Prospectus Supplement with respect to an offering of Securities
will set forth the terms of such offering, including, to the extent applicable,
the name or names of any underwriters (and any managing underwriters), the names
of any dealers or agents, the purchase price of the Securities and the proceeds
to the Company or the Trust from such sale, any underwriting discounts and
commissions or agency fees and other items constituting underwriters' or agents'
compensation, any initial public offering price and any discounts or concessions
allowed or reallowed or paid to dealers and any securities exchanges or
interdealer quotation system on which such Securities are expected to be listed.
Any initial public offering price and any discounts or concessions allowed or
reallowed or paid to dealers may be changed from time to time.
 
     Securities may be offered and sold, and offers to purchase such securities
may be solicited, by agents designated by the Company or the Trust from time to
time. Any such agent involved in the offer or sale of the Securities in respect
of which this Prospectus is delivered will be named, and the terms of such
agency (including any commissions payable by the Company or the Trust to such
agent) will be set forth, in the applicable Prospectus Supplement. Unless
otherwise indicated in such Prospectus Supplement, any such agent will be acting
on a best efforts basis for the period of its appointment.
 
     If an underwriter or underwriters are utilized in the sale of Securities,
the Company or the Trust will execute an underwriting agreement with such
underwriter or underwriters at the time an agreement for such sale is reached,
and the names of the managing underwriter or managing underwriters, as well as
any other underwriters, and the terms of the transaction, including commissions,
discounts and other compensation of the underwriters and dealers, if any, will
be set forth in the Prospectus Supplement, which will be used by the
underwriters to make resales of the Securities in respect of which such
Prospectus Supplement is delivered to the public. If underwriters are used in
the sale, such underwriters will acquire Securities for their own account and
may resell such Securities from time to time in one or more transactions,
including negotiated transactions, at fixed public offering prices or at varying
prices determined by the underwriter at the time of sale. Securities may be
offered to the public either through underwriting syndicates represented by
managing underwriters, or directly by underwriters without a syndicate. Only
underwriters named in the Prospectus Supplement are deemed to be underwriters in
connection with the Securities offered thereby. If any underwriters are utilized
in the sale of the Securities, unless otherwise set forth in the Prospectus
Supplement relating thereto the underwriting agreement will provide that the
obligations of the underwriters are subject to certain conditions precedent and
that the underwriters with respect to a sale of Securities will be obligated to
purchase all such Securities, if any are purchased.
 
     If a dealer is utilized in the sale of the Securities, the Company or the
Trust will sell such Securities to the dealer, as principal. The dealer may then
resell such Securities to the public at varying prices to be determined by such
dealer at the time of resale. The name of the dealer and the terms of the
transaction will be set forth in the Prospectus Supplement relating thereto.
 
     Agents, underwriters and dealers may be entitled under agreements that may
be entered into with the Company or the Trust to indemnification by the Company
or the Trust against certain liabilities, including liabilities under the
Securities Act of 1933, as amended, or to contribution with respect to payments
which the agents, underwriters or dealers may be required to make in respect
thereof. Agents, underwriters and dealers may be customers of, engage in
transactions with, or perform services for the Company and affiliates of the
Company. Any agents, dealers or underwriters participating in the offering of
Securities may be deemed "underwriters" within the meaning of the Securities Act
of 1933, as amended, of the Securities so offered.
 
     Offers to purchase Securities may be solicited directly by the Company or
the Trust and sales thereof may be made by the Company or the Trust directly to
institutional investors or others, who may be deemed to be underwriters within
the meaning of the Securities Act with respect to any resale thereof. The terms
of any such sales, including the terms of any bidding or auction process, if
utilized, will be described in the Prospectus Supplement relating thereto.
 
     Each series of Securities will be a new issue of securities and may have no
established trading market. Agents and underwriters may from time to time
purchase and sell Securities in the secondary market or may
 
                                       18
<PAGE>   33
 
make a market in the Securities, but are not obligated to do so, and there can
be no assurance that there will be a secondary market for the Securities or
liquidity in the secondary market if one develops.
 
     If so indicated in the applicable Prospectus Supplement, the Company or the
Trust will authorize agents, underwriters or dealers to solicit offers by
certain institutions to purchase Securities from the Company or the Trust at the
public offering price set forth in the applicable Prospectus Supplement pursuant
to Delayed Delivery Contracts ("Contracts") providing for payment and delivery
on a specified date in the future. A commission indicated in the applicable
Prospectus Supplement will be paid to underwriters, dealers or agents soliciting
purchases of Securities pursuant to Contracts accepted by the Company or the
Trust. The Contracts will be subject to the conditions set forth in the
applicable Prospectus Supplement.
 
     As one of the means of direct issuances of Securities, the Company or the
Trust may utilize the services of an entity through which it may conduct an
electronic "dutch auction" or similar offering of the Securities among potential
purchasers who are eligible to participate in the auction or offering of such
Securities, if so described in the applicable Prospectus Supplement.
 
     The anticipated place and time of delivery for the Securities in respect of
which this Prospectus is delivered will be set forth in the applicable
Prospectus Supplement.
 
                                 LEGAL MATTERS
 
     The validity of the Securities offered hereby other than the Preferred
Securities will be passed upon for the Company and the Trust by Keating,
Muething & Klekamp, P.L.L., Cincinnati, Ohio. Certain United States federal
income taxation matters also will be passed upon for the Company and the Trust
by Akin, Gump, Strauss, Hauer & Feld, L.L.P., Washington, D.C. Attorneys in the
Keating, Muething & Klekamp law firm hold certain Securities of the Company and
the Trust. Certain matters of Delaware law relating to the validity of the
Preferred Securities will be passed upon for the Trust by Morris, Nichols, Arsht
& Tunnell, Wilmington, Delaware.
 
                                    EXPERTS
 
     The consolidated financial statements of the Company's predecessor
appearing in its Annual Report (Form 10-K) for the year ended December 31, 1996,
as amended, have been audited by Ernst & Young LLP, independent auditors, as set
forth in their report thereon included therein and incorporated herein by
reference. Such consolidated financial statements are incorporated herein by
reference in reliance upon such report given upon the authority of such firm as
experts in accounting and auditing.
 
                                       19
<PAGE>   34
 
- ---------------------------------------------------------
 
NO DEALER, SALESPERSON OR OTHER PERSON HAS BEEN AUTHORIZED TO GIVE ANY
INFORMATION OR TO MAKE ANY REPRESENTATION NOT CONTAINED IN THIS PROSPECTUS
SUPPLEMENT OR THE PROSPECTUS, AND, IF GIVEN OR MADE, SUCH INFORMATION OR
REPRESENTATION MUST NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED BY THE COMPANY,
OR ANY UNDERWRITER. THIS PROSPECTUS SUPPLEMENT AND THE PROSPECTUS DO NOT
CONSTITUTE AN OFFER TO SELL OR A SOLICITATION OF ANY OFFER TO BUY ANY OF THE
SECURITIES OFFERED HEREBY IN ANY JURISDICTION TO ANY PERSON TO WHOM IT IS
UNLAWFUL TO MAKE SUCH OFFER IN SUCH JURISDICTION. NEITHER THE DELIVERY OF THIS
PROSPECTUS SUPPLEMENT OR THE PROSPECTUS, NOR ANY SALE MADE HEREUNDER SHALL,
UNDER ANY CIRCUMSTANCES, CREATE ANY IMPLICATION THAT THE INFORMATION HEREIN IS
CORRECT AS OF ANY TIME SUBSEQUENT TO THE DATE HEREOF OR THAT THERE HAS BEEN NO
CHANGE IN THE AFFAIRS OF THE COMPANY SINCE SUCH DATE.
 
                               ------------------
 
                               TABLE OF CONTENTS
 
                             PROSPECTUS SUPPLEMENT
 
<TABLE>
<CAPTION>
                                           PAGE
                                           ----
<S>                                        <C>
Prospectus Supplement Summary...........    S-2
The Company.............................    S-2
The Offering............................    S-2
Recent Developments.....................    S-3
Summary Historical Financial
  Information...........................    S-4
Risk Factors............................    S-5
Capitalization..........................    S-9
Use of Proceeds.........................   S-10
Description of Senior Debentures........   S-10
Underwriting............................   S-12
 
                  PROSPECTUS
Available Information...................      2
Incorporation of Certain Documents by
  Reference.............................      3
The Company.............................      4
The Trust...............................      4
Use of Proceeds.........................      5
Ratio of Earnings to Fixed Charges......      5
Description of Debt Securities..........      6
Description of Common Stock.............     14
Description of Preferred Securities of
  the Trust.............................     14
Description of Trust Guarantee..........     15
Plan of Distribution....................     18
Legal Matters...........................     19
Experts.................................     19
</TABLE>
 
=========================================================
                                  $100,000,000
                         AMERICAN FINANCIAL GROUP, INC.
                            7 1/8% Senior Debentures
                                    Due 2007
                             PROSPECTUS SUPPLEMENT
                           CREDIT SUISSE FIRST BOSTON
 
                            BEAR, STEARNS & CO. INC.
 
                          DONALDSON, LUFKIN & JENRETTE
                             SECURITIES CORPORATION
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