NEW HAMPSHIRE THRIFT BANCSHARES INC
S-8, 1998-10-29
SAVINGS INSTITUTION, FEDERALLY CHARTERED
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<PAGE>
 
As filed with the Securities and Exchange Commission on October    , 1998  
REGISTRATION NO.
- --------------------------------------------------------------------------------

                       SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C.  20549
                                _______________

                                    FORM S-8
                             REGISTRATION STATEMENT
                                     under
                           THE SECURITIES ACT OF 1933
                                _______________

                     NEW HAMPSHIRE THRIFT BANCSHARES, INC.
             (Exact name of registrant as specified in its charter)
<TABLE>
<S>                                                 <C>
        DELAWARE                                           02-0430695
(State or other jurisdiction                             (I.R.S. Employer
of incorporation or organization)                       Identification No.)
 
</TABLE>
                                 9 Main Street
                                   P.O. Box 9
                               Newport, NH 03773
                                 (603) 863-0886
         (Address, including Zip Code, of principal executive offices)
                                _______________

                     New Hampshire Thrift Bancshares, Inc.
                             1998 Stock Option Plan
                           (Full title of the Plans)
                                _______________

                             Mr. Stephen W. Ensign
                     President and Chief Executive Officer
                     New Hampshire Thrift Bancshares, Inc.
                                 9 Main Street
                               Newport, NH 03773
                                 (603) 863-0886

                                    Copy to:
                           Richard A. Schaberg, Esq.
                            Thacher Proffitt & Wood
                    1700 Pennsylvania Avenue, N.W. Suite 800
                            Washington, D.C.  20006
                                 (202) 347-8400
(Name and address, including Zip Code, telephone number and area code, of agent
                                  for service)
                                _______________

                        CALCULATION OF REGISTRATION FEE
<TABLE>
<CAPTION>
====================================================================================================================================
<S>                          <C>                        <C>                      <C>                           <C> 
Title of Securities to be     Amount to be Registered      Proposed Maximum        Proposed Maximum Aggregate       Amount of
 Registered                    (1)                        Offering Price Per         Offering Price (2)        Registration Fee
                                                              Share(2)
- ------------------------------------------------------------------------------------------------------------------------------------
Common Stock, $0.01           208,855 shares                   $17.625                   $3,681,069                 $1024.00
    par value 
====================================================================================================================================
</TABLE>
(1) Based on 208,855 shares of common stock of New Hampshire Thrift Bancshares,
    Inc. (the "Company") reserved for issuance upon exercise of options granted
    pursuant to the New Hampshire Thrift Bancshares, Inc. 1998 Stock Option Plan
    ("Plans").  In addition to such shares, this registration statement also
    covers an undetermined number of shares of common stock of the Company that,
    by reason of certain events specified in the Plans, may become issuable upon
    exercise options through the use of certain anti-dilution provisions.

(2) Estimated solely for purpose of calculating the registration fee in
    accordance with Rule 457 of the Securities Act of 1933, pursuant to which at
    total of 208,855 shares that may be acquired upon exercise of options
    granted in the future are deemed to be offered at $17.625 per share, the
    average of the daily high and low sales prices of common stock of the
    Company on the Nasdaq Stock Market at the close of trading on October 26,
    1998.
<PAGE>
 
                                     PART I

              INFORMATION REQUIRED IN THE SECTION 10(A) PROSPECTUS


ITEM 1.   PLAN INFORMATION.

          Not required to be filed with the Securities and Exchange Commission
(the "Commission").


ITEM 2.   REGISTRANT INFORMATION AND EMPLOYEE PLAN ANNUAL INFORMATION.

          Not required to be filed with the Commission.


          Note:  The document containing the information specified in this Part
I will be sent or given to employees as specified by Rule 428(b)(1).  Such
document need not be filed with the Commission either as part of this
registration statement or as prospectuses or prospectus supplements pursuant to
Rule 424.  These documents and the documents incorporated by reference in this
registration statement pursuant to Item 3 of Part II of this form, taken
together, constitute a prospectus that meets the requirements of Section 10(a)
of the Securities Act of 1933, as amended ("Securities Act").


                                    PART II


ITEM 3.   INCORPORATION OF DOCUMENTS BY REFERENCE.

          The following documents and information heretofore filed with the
Commission by the Registrant (File No. 01-17859) are incorporated by reference
in this registration statement:

     (1) the description of the Registrant's common stock (the "Common Stock")
     contained in the Registrant's Registration Statement on Form S-4, dated
     September 25, 1996 which was filed with the Commission pursuant to the
     Securities Exchange Act of 1934, as amended ("Exchange Act");

     (2) the Registrant's Annual Report on Form 10-KSB for the fiscal year ended
     December 1997, which was filed with the Commission pursuant to the Exchange
     Act;

     (3) the Registrant's Proxy Statement, dated March 6, 1998 for its Annual
     Meeting of Stockholders held on April 8, 1998, filed by the Registrant
     pursuant to Section 14 of the Exchange Act; and
      

                                       2
<PAGE>
 
     (4) the Registrant's  Quarterly Report on Form 10-QSB for the quarters
     ended March 31, 1998 and June 30, 1998.

All documents filed by the Registrant pursuant to Sections 13(a), 13(c), 14 and
15(d) of the Exchange Act after the date hereof and prior to the date of the
termination of the offering of the Common Stock offered hereby shall be deemed
to be incorporated by reference into this Registration Statement and to be a
part hereof from the date of filing of such documents.  Any statement contained
herein or in a document incorporated or deemed to be incorporated by reference
herein shall be deemed to be modified or superseded for purposes of this
Registration Statement to the extent that a statement contained herein or in any
document which is or is deemed to be incorporated by reference herein modifies
or supersedes such statement.  Any statement so modified or superseded shall not
be deemed, except as so modified or superseded, to constitute a part of this
Registration Statement.

          New Hampshire Thrift Bancshares, Inc. will provide without charge to
each person to whom this Prospectus is delivered, upon request of any such
person, a copy of any or all of the foregoing documents incorporated herein by
reference (other than exhibits to such documents). Written requests should be
directed to Mr. Stephen R. Theroux, New Hampshire Thrift Bancshares, Inc., 9
Main Street, P.O. Box 9, Newport, NH 03773.  Telephone requests may be directed
to (603) 863-0886.

ITEM 4.   DESCRIPTION OF SECURITIES.

          Not applicable.

ITEM 5.   INTERESTS OF NAMED EXPERTS AND COUNSEL.

          Not applicable.

ITEM 6.   INDEMNIFICATION OF DIRECTORS AND OFFICERS.

          Section 145 of the Delaware General Corporation Law ("DGCL") inter
alia, empowers a Delaware corporation to indemnify any person who was or is a
party or is threatened to be made a party to any threatened, pending or
completed action, suit or proceeding (other than an action by or in the right of
the corporation) by reason of the fact that such person is or was a director,
officer, employee or agent of another corporation or other enterprise, against
expenses (including attorneys' fees), judgments, fines and amounts paid in
settlement actually and reasonably incurred by him in connection with such
action, suit or proceeding if he acted in good faith and in a manner he
reasonably believed to be in or not opposed to the best interest of the
corporation, and, with respect to any criminal action or proceeding, had no
reasonable cause to believe his conduct was unlawful.  Similar indemnity is
authorized for such person against expenses (including attorneys' fees) actually
and reasonably incurred in connection with the defense or settlement of any such
threatened, pending or completed action or suit if such person acted in good
faith and in a manner he reasonably believed to be in or not opposed to the best
interests of the corporation, and provided further that (unless a court of
competent jurisdiction otherwise provides) such person shall not have 

                                       3
<PAGE>
 
been adjudged liable to the corporation. Any such indemnification may be made
only as authorized in each specific case upon a determination by the
shareholders or disinterested directors or by independent legal counsel in a
written opinion that indemnification is proper because the indemnitee has met
the applicable standard of conduct.

          Section 145 further authorizes a corporation to purchase and maintain
insurance on behalf of any person who is or was a director, officer, employee or
agent of the corporation, or is or was serving at the request of the corporation
as a director, officer, employee or agent of another corporation or enterprise,
against any liability asserted against him, an incurred by him in any such
capacity, or arising out of his status as such, whether or not the corporation
would otherwise have the power to indemnify him under Section 145.

          Article IX of the Company's bylaws requires the Company, among other
things, to indemnify any person who was or is a party or is threatened to be
made a party to any threatened, pending or completed action, suit or proceeding,
and any appeal therein, whether civil, criminal, administrative, arbitrative or
investigate (other than an action by or in the right of the Corporation) by
reason of the fact that he or she is or was a director, officer, trustee,
employee or agent of the Corporation, or is or was serving at the request of the
Corporation as a director, officer, trustee, employee or agent of another
corporation, association, partnership, joint venture, trust or other enterprise,
against expenses (including attorney's fees), judgments, fines, penalties and
amounts paid in settlement actually and reasonably incurred by him in connection
with such action, suit or proceeding, and any appeal therein, if he acted in
good faith and in a manner he reasonably believed to be in or not opposed to the
best interests of the Corporation, and, with respect to any criminal action or
proceeding, had no reasonable cause to believe his conduct was unlawful.

          Article XI, Section 8 also empowers the Company to purchase and
maintain insurance to protect itself and its directors and officers, and those
who were or have agreed to become directors or officers, against any liability,
regardless of whether or not the Company would have the power to indemnify those
persons against such liability under the law or the provisions set forth in the
Certificate of Incorporation.  The Company currently maintains directors' and
officers' liability insurance consistent with the provisions of the bylaws.

          The Company has entered into Employment Agreements with each of
Stephen W. Ensign and Stephen R. Theroux pursuant to which it has undertaken
contractually to provide indemnification and insurance coverage in the manner
described above.


ITEM 7.   EXEMPTION FROM REGISTRATION CLAIMED.

          Not applicable.

                                       4
<PAGE>
 
ITEM 8.   EXHIBITS.
 
          3.1  Certificate of Incorporation of New Hampshire Thrift Bancshares,
          Inc.*
          3.2  By-Laws of New Hampshire Thrift Bancshares, Inc.*
          4.1  New Hampshire Thrift Bancshares, Inc. 1998 Stock Option Plan.
          4.2  Form of Stock Option Agreement, pursuant to the New Hampshire
               Thrift Bancshares, Inc. 1998 Stock Option Plan.
          5.1  Opinion of Thacher Proffitt & Wood, counsel for Registrant, as to
               the legality of the securities being registered.
          23.1 Consent of Thacher Proffitt & Wood (included in Exhibit 5.1
               hereof).
          23.2 Consent of Shatswell MacLeod & Co., P.C.

*  Incorporated by reference to the Registrant's Registration Statement on Form
   S-4, as amended    (Registration No. 333-12645).

ITEM 9.   UNDERTAKINGS.

     A.   Rule 415 offering.  The undersigned Registrant hereby undertakes:
          -----------------                                                

          (1) For determining liability under the Securities Act , treat each
post-effective amendment as a new registration statement of the securities
offered, and the offering of the securities at that time to be the initial bona
fide offering.

          (2) File a post-effective amendment to remove from registration any of
the securities that remain unsold at the end of the offering.

                                       5
<PAGE>
 
                                   SIGNATURES

          Pursuant to the requirements of the Securities Act of 1933, the
Registrant certifies that it has reasonable grounds to believe that it meets all
of the requirements for filing on Form S-8 and has duly caused this Registration
Statement to be signed on its behalf by the undersigned, thereunto duly
authorized, in the City of Newport, State of New Hampshire, on this 14th day of
October, 1998.

                                    NEW HAMPSHIRE THRIFT BANCSHARES, INC.
                                    (Registrant)

                                    By: /s/   Stephen W. Ensign
                                        -------------------------------------
                                       Stephen W. Ensign
                                       President and Chief Executive Officer

          Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed by the following persons in the
capacities and on the dates indicated.

<TABLE>
<CAPTION>
<S>                        <C>                                    <C>
Signature                                  Title                       Date
- -------------------------  -------------------------------------  ------------
/s/ Stephen W. Ensign      President and Chief Executive          October 14,1998
- -------------------------  Officer (Principal Executive
Stephen W. Ensign          Officer) and Director
                          
/s/ Daryl Cady             Chief Financial Officer (Principal     October 14, 1998
- -------------------------  Accounting Officer)
Daryl Cady
 
/s/ Stephen R. Theroux     Director and Executive Vice President  October 14, 1998
- -------------------------
Stephen R. Theroux

/s/ John J. Kiernan        Chairman of the Board and Director     October 14, 1998
- -------------------------
John J. Kiernan

/s/ Leonard R. Cashman     Director                               October 14, 1998
- -------------------------
Leonard R. Cashman

/s/ Ralph B. Fifield       Director                               October 14, 1998
- -------------------------
Ralph B. Fifield

/s/ John A. Kelley, Jr.    Director                               October 14, 1998
- -------------------------
John A. Kelley, Jr.

/s/ Peter R. Lovely        Director                               October 14, 1998
- -------------------------
Peter R. Lovely

/s/ Dennis A. Morrow       Director                               October 14, 1998
- -------------------------
Dennis A. Morrow

/s/ Jack H. Nelson 
- -------------------------  Director                               October 14, 1998
Jack H. Nelson

/s/ Priscilla W. Ohler     Director                               October 14, 1998
- -------------------------
Priscilla W. Ohler

/s/ Kenneth D. Weed 
- -------------------------  Director                               October 14, 1998
Kenneth D. Weed

</TABLE>


 
 

                                       6

<PAGE>
 
                                                                     EXHIBIT 4.1



                     NEW HAMPSHIRE THRIFT BANCSHARES, INC.

                            1998 STOCK OPTION PLAN


                   -----------------------------------------
<PAGE>
 
 
                               TABLE OF CONTENTS
                               -----------------
<TABLE>
<CAPTION>
                                                                            PAGE
                                                                            ----
<S>            <C>                                                          <C>
                                   ARTICLE I
                                   ---------

                                    PURPOSE
                                    -------

SECTION 1.1    GENERAL PURPOSE OF THE PLAN..................................  1

                                  ARTICLE II
                                  ----------

                                  DEFINITIONS
                                  -----------
SECTION 2.1    BANK.........................................................  1
SECTION 2.2    BOARD........................................................  1
SECTION 2.3    CHANGE IN CONTROL............................................  1
SECTION 2.4    CODE.........................................................  3
SECTION 2.5    COMPANY......................................................  3
SECTION 2.6    DISABILITY...................................................  3
SECTION 2.7    DISINTERESTED BOARD MEMBER...................................  3
SECTION 2.8    EFFECTIVE DATE...............................................  3
SECTION 2.9    ELIGIBLE DIRECTOR............................................  3
SECTION 2.10   ELIGIBLE EMPLOYEE............................................  3
SECTION 2.11   EMPLOYER.....................................................  4
SECTION 2.12   EXCHANGE ACT.................................................  4
SECTION 2.13   EXERCISE PRICE...............................................  4
SECTION 2.14   FAIR MARKET VALUE............................................  4
SECTION 2.15   FAMILY MEMBER................................................  4
SECTION 2.16   INCENTIVE STOCK OPTION.......................................  4
SECTION 2.17   NON-PROFIT ORGANIZATION......................................  5
SECTION 2.18   NON-QUALIFIED STOCK OPTION...................................  5
SECTION 2.19   OPTION.......................................................  5
SECTION 2.20   OPTION PERIOD................................................  5
SECTION 2.21   OTS REGULATIONS..............................................  5
SECTION 2.22   PERSON.......................................................  5
SECTION 2.23   PLAN.........................................................  5
SECTION 2.24   PLAN ADMINISTRATORS.............................. ...........  5
SECTION 2.25   RETIREMENT...................................................  5
SECTION 2.26   SHARE........................................................  5
SECTION 2.27   TERMINATION FOR CAUSE........................................  5
</TABLE> 

                                      (i)

<PAGE>
 
 
<TABLE> 
<CAPTION> 
                                                                            PAGE
                                                                            ----
<S>            <C>                                                          <C>
                                  ARTICLE III
                                  -----------

                                AVAILABLE SHARES
                                ----------------

SECTION 3.1    AVAILABLE SHARES.............................................  7

                                   ARTICLE IV
                                   ----------

                                 ADMINISTRATION
                                 --------------
 
SECTION 4.1    PLAN ADMINISTRATORS..........................................  7
SECTION 4.2    PLAN ADMINISTRATORS' ACTION..................................  7
SECTION 4.3    PLAN ADMINISTRATORS' AUTHORITY...............................  8

                                   ARTICLE V
                                   ---------

                      STOCK OPTIONS FOR ELIGIBLE DIRECTORS
                      ------------------------------------
 
SECTION 5.1    IN GENERAL...................................................  8
SECTION 5.2    EXERCISE PRICE...............................................  9
SECTION 5.3    OPTION PERIOD................................................  9
SECTION 5.4    VESTING OF OPTIONS...........................................  9

                                   ARTICLE VI
                                   ----------

                      STOCK OPTIONS FOR ELIGIBLE EMPLOYEES
                      ------------------------------------
 
SECTION 6.1    SIZE OF OPTION............................................... 10
SECTION 6.2    GRANT OF OPTIONS............................................. 10
SECTION 6.3    EXERCISE PRICE............................................... 11
SECTION 6.4    OPTION PERIOD................................................ 11
SECTION 6.5    REQUIRED REGULATORY PROVISIONS............................... 11
SECTION 6.6    ADDITIONAL RESTRICTIONS ON INCENTIVE STOCK OPTIONS........... 12

                                  ARTICLE VII
                                  -----------

                             OPTIONS -- IN GENERAL
                             ---------------------

SECTION 7.1    METHOD OF EXERCISE........................................... 14
SECTION 7.2    LIMITATIONS ON OPTIONS....................................... 15
</TABLE> 

                                      (ii)

<PAGE>
 
 
<TABLE> 
<CAPTION> 
                                                                            PAGE
                                                                            ----
<S>            <C>                                                          <C>
                                  ARTICLE VIII
                                  ------------

                           AMENDMENT AND TERMINATION
                           -------------------------
SECTION 8.1    TERMINATION.................................................. 16
SECTION 8.2    AMENDMENT.................................................... 16
SECTION 8.3    ADJUSTMENTS IN THE EVENT OF A BUSINESS REORGANIZATION........ 16

                                   ARTICLE IX
                                   ----------

                                 MISCELLANEOUS
                                 -------------

SECTION 9.1    STATUS AS AN EMPLOYEE BENEFIT PLAN........................... 17
SECTION 9.2    NO RIGHT TO CONTINUED EMPLOYMENT............................. 18
SECTION 9.3    CONSTRUCTION OF LANGUAGE..................................... 18
SECTION 9.4    GOVERNING LAW................................................ 18
SECTION 9.5    HEADINGS..................................................... 18 
SECTION 9.6    NON-ALIENATION OF BENEFITS................................... 18
SECTION 9.7    TAXES........................................................ 18
SECTION 9.8    APPROVAL OF SHAREHOLDERS..................................... 19
SECTION 9.9    NOTICES...................................................... 19

                                   ARTICLE X
                                   ---------

                                 THE TRUST FUND
                                 --------------
 
SECTION 10.1   ESTABLISHMENT OF A TRUST..................................... 20
SECTION 10.2   THE TRUST FUND............................................... 20
SECTION 10.3   INVESTMENTS OF THE TRUST FUND................................ 20
</TABLE> 

                                     (iii)

<PAGE>
 
                     NEW HAMPSHIRE THRIFT BANCSHARES, INC.
                     -------------------------------------
                            1998 STOCK OPTION PLAN
                            ----------------------

                                   ARTICLE I
                                   ---------

                                    PURPOSE
                                    -------

          SECTION 1.1   GENERAL PURPOSE OF THE PLAN.
                        --------------------------- 

          The purpose of the Plan is to promote the growth and profitability of
New Hampshire Thrift Bancshares, Inc., to provide eligible directors, key
officers and employees of New Hampshire Thrift Bancshares, Inc. and its
affiliates with an incentive to achieve corporate objectives, to attract and
retain individuals of outstanding competence and to provide such individuals
with an equity interest in New Hampshire Thrift Bancshares, Inc.

                                  ARTICLE II
                                  ----------

                                  DEFINITIONS
                                  -----------

          The following definitions shall apply for the purposes of this Plan,
unless a different meaning is plainly indicated by the context:

          SECTION 2.1    BANK means Lake Sunapee Bank, f.s.b., a federally
                         ----                                             
chartered savings bank, and any successor thereto.

           SECTION 2.2   BOARD means the Board of Directors of the Company.
                         -----                                             

           SECTION 2.3   CHANGE IN CONTROL means any of the following events:
                         -----------------                                   

          (a) the occurrence of any event upon which any "person" (as such term
     is used in sections 13(d) and 14(d) of the Securities Exchange Act of 1934,
     as amended ("Exchange Act")), other than (A) a trustee or other fiduciary
     holding securities under an employee benefit plan maintained for the
     benefit of employees of the Company; (B) a corporation owned, directly or
     indirectly, by the stockholders of the Company in substantially the same
     proportions as their ownership of stock of the Company; or (C) any group
     constituting a person in which employees of the Company are substantial
     members, becomes the "beneficial owner" (as defined in Rule 13d-3
     promulgated under the Exchange Act), directly or indirectly, of securities
     issued by the Company representing 20% or more of the combined voting power
     of all of the Company's then outstanding securities, for any securities
     purchased by the Company's employee stock ownership plan and trust; and
<PAGE>
 
          (b) the occurrence of any event upon which the individuals who on the
     date the Plan is adopted are members of the Board, together with
     individuals whose election by the Board or nomination for election by the
     Company's stockholders was approved by the affirmative vote of at least
     three-quarters of the members of the Board then in office who were either
     members of the Board on the date this Plan is adopted or whose nomination
     or election was previously so approved, cease for any reason to constitute
     a majority of the members of the Board, but excluding, for this purpose,
     any such individual whose initial assumption of office is in connection
     with an actual or threatened election contest relating to the election of
     directors of the Company (as such terms are used in Rule 14a-11 of
     Regulation 14A promulgated under the Exchange Act); or

          (c) the shareholders of the Company approve either:

               (i) a merger or consolidation of the Company with any other
          corporation, other than a merger or consolidation following which both
          of the following conditions are satisfied:

                    (A) either (I) the members of the Board of the Company
               immediately prior to such merger or consolidation constitute at
               least a majority of the members of the governing body of the
               institution resulting from such merger or consolidation; or (II)
               the shareholders of the Company own securities of the institution
               resulting from such merger or consolidation representing 80% or
               more of the combined voting power of all such securities of the
               resulting institution then outstanding in substantially the same
               proportions as their ownership of voting securities of the
               Company immediately before such merger or consolidation; and

                    (B) the entity which results from such merger or
               consolidation expressly agrees in writing to assume and perform
               the Company's obligations under the Plan; or

               (ii) a plan of complete liquidation of the Company or an
          agreement for the sale or disposition by the Company of all or
          substantially all of its assets; and
 
          (d)  the occurrence of an event which would require the Company to
     report a response it to Item 1(a) of the current report on Form 8-K, as in
     effect on the date hereof, pursuant to Section 13 or 15(d) of the Exchange
     Act of 1934;

                                      -2-
<PAGE>
 
          (e)  the occurrence of an event which would result in a Change in
     Control of the Bank within the meaning of the Home Owners' Loan Act of 1933
     and the Rules and Regulations promulgated by the Office of Thrift
     Supervision ("OTS"), as in effect on the date hereof (provided that in
     applying the definition of change in control as set forth in the rules and
     regulations of the OTS, the Board shall substitute its judgment for that of
     the OTS); and

          (f)  any event that would be described in section 2.3(a), (b), (c) or
     (d) if "the Bank" were substituted for "the Company" therein.

          SECTION 2.4    CODE means the Internal Revenue Code of 1986 (including
                         ----                                                   
the corresponding provisions of any succeeding law).

          SECTION 2.5    COMPANY means New Hampshire Thrift Bancshares, Inc., a
                         -------                                               
corporation organized and existing under the laws of the State of Delaware, and
any successor thereto.

          SECTION 2.6    DISABILITY means a condition of total incapacity,
                         ----------                                       
mental or physical, for further performance of duty with the Employer which the
Plan Administrators shall have determined, on the basis of competent medical
evidence, is likely to be permanent.

          SECTION 2.7    DISINTERESTED BOARD MEMBER means a member of the Board
                         --------------------------                            
who (a) is not a current employee of the Company or a subsidiary, (b) is not a
former employee of the Company who receives compensation for prior services
(other than benefits under a tax-qualified retirement plan) during the taxable
year, (c) has not been an officer of the Company, (d) does not receive
remuneration from the Company or a subsidiary, either directly or indirectly, in
any capacity other than as a director and (e) does not possess an interest in
any other transaction, and is not engaged in a business relationship, for which
disclosure would be required pursuant to Item 404(a) or (b) of the proxy
solicitation rules of the Securities and Exchange Commission.  The term
Disinterested Board Member shall be interpreted in such manner as shall be
necessary to conform to the requirements of section 162(m) of the Code or Rule
16b-3 promulgated under the Exchange Act.

          SECTION 2.8    EFFECTIVE DATE means April 8, 1998.
                         --------------                     

          SECTION 2.9    ELIGIBLE DIRECTOR means a member of the board of
                         -----------------                               
directors of an Employer who is not also an employee or an officer of an
Employer.

          SECTION 2.10   ELIGIBLE EMPLOYEE means any employee whom the Plan
                         -----------------                                 
Administrators may determine to be a key officer or employee of an Employer and
select to receive a grant of an Option pursuant to the Plan.

                                      -3-
<PAGE>
 
          SECTION 2.11   EMPLOYER means the Company, the Bank and any successor
                         --------                                              
thereto and, with the prior approval of the Board, and subject to such terms and
conditions as may be imposed by the Board, any other savings bank, savings and
loan association, bank, corporation, financial institution or other business
organization or institution.  With respect to any Eligible Employer or Eligible
Director, the Employer shall mean the entity which employs such person or upon
whose board of directors such person serves.

           SECTION 2.12  EXCHANGE ACT means the Securities Exchange Act of 1934,
                         ------------                                           
as amended.

          SECTION 2.13   EXERCISE PRICE means the price per Share at which
                         --------------                                   
Shares subject to an Option may be purchased upon exercise of the Option;
provided, however, that the Exercise Price shall not be less than the Fair
Market Value of a Share on the date on which the Option is granted.

           SECTION 2.14  FAIR MARKET VALUE means, with respect to a Share on a
                         -----------------                                    
specified date:

          (a) the final reported sales price on the date in question (or if
     there is no reported sale on such date, on the last preceding date on which
     any reported sale occurred) as reported in the principal consolidated
     reporting system with respect to securities listed or admitted to trading
     on the principal United States securities exchange on which the Shares are
     listed or admitted to trading; or

          (b) if the Shares are not listed or admitted to trading on any such
     exchange, the closing bid quotation with respect to a Share on such date on
     the National Association of Securities Dealers Automated Quotations System,
     or, if no such quotation is provided, on another similar system, selected
     by the Plan Administrators, then in use; or

          (c) if sections 2.14(a) and (b) are not applicable, the fair market
     value of a Share as the Plan Administrators may determine.

          SECTION 2.15  FAMILY MEMBER means the spouse, parent, child or
                        -------------                                   
sibling of an Eligible Director or Eligible Employee.

          SECTION 2.16   INCENTIVE STOCK OPTION means a right to purchase Shares
                         ----------------------                                 
that is granted to an Eligible Employee pursuant to section 6.1, that is
designated by the Plan Administrators to be an Incentive Stock Option and that
is intended to satisfy the requirements of section 422 of the Code.

                                      -4-
<PAGE>
 
          SECTION 2.17   NON-PROFIT ORGANIZATION means any organization which is
                         -----------------------                                
exempt from federal income tax under section 501(c)(3), (4), (5), (6), (7), (8)
or (10) of the Code.

          SECTION 2.18   NON-QUALIFIED STOCK OPTION means a right to purchase
                         --------------------------                          
Shares that is granted pursuant to section 5.1 or 6.1.  For Eligible Employees,
an Option will be a Non-Qualified Stock Option if (a) it is not designated by
the Plan Administrators to be an Incentive Stock Option, or (b) it does not
satisfy the requirements of section 422 of the Code.

          SECTION 2.19  OPTION means either an Incentive Stock Option or a Non-
                        ------                                                
Qualified Stock Option.

          SECTION 2.20   OPTION PERIOD means the period during which an Option
                         -------------                                        
may be exercised, determined in accordance with sections 5.3 and 6.4.

          SECTION 2.21   OTS REGULATIONS means the regulations issued by the
                         ---------------                                    
Office of Thrift Supervision and applicable to the Bank.

          SECTION 2.22   PERSON means an individual, a corporation, a bank, a
                         ------                                              
savings bank, a savings and loan association, a financial institution, a
partnership, an association, a joint-stock company, a trust, an estate, an
unincorporated organization and any other business organization or institution.

          SECTION 2.23  PLAN means the New Hampshire Thrift Bancshares, Inc.
                        ----                                                
1998 Stock Option Plan, as amended from time to time.

          SECTION 2.24   PLAN ADMINISTRATORS shall mean the individuals
                         -------------------                           
described in section 4.1.

          SECTION 2.25   RETIREMENT means retirement at or after the normal or
                         ----------                                           
early retirement date set forth in any tax-qualified retirement plan of the
Bank.

           SECTION 2.26  SHARE means a share of Common Stock, par value $.01 per
                         -----                                                  
share, of New Hampshire Thrift Bancshares, Inc.

           SECTION 2.27  TERMINATION FOR CAUSE means one of the following:
                         ---------------------                            

          (a) with respect to an Eligible Employee who is not an officer or
     employee of any bank or savings institution regulated by the Office of
     Thrift Supervision, "Termination for Cause" means termination of employment
     with the Employer upon the occurrence of any of the following: (i) the
     employee intentionally engages in dishonest conduct in connection with his
     performance of services for the Employer resulting in his conviction 

                                      -5-
<PAGE>
 
     of a felony; (ii) the employee is convicted of, or pleads guilty or nolo
     contendere to, a felony or any crime involving moral turpitude; (iii) the
     employee willfully fails or refuses to perform his duties under any
     employment or retention agreement and fails to cure such breach within
     sixty (60) days following written notice thereof from the Employer; (iv)
     the employee breaches his fiduciary duties to the Employer for personal
     profit; or (v) the employee's willful breach or violation of any law, rule
     or regulation (other than traffic violations or similar offenses), or final
     cease and desist order in connection with his performance of services for
     the Employer;

          (b) with respect to an Eligible Employee who is an officer or employee
     of a bank or savings institution regulated by the Office of Thrift
     Supervision, "Termination for Cause" means termination of employment for
     personal dishonesty, incompetence, willful misconduct, breach of fiduciary
     duty involving personal profit, intentional failure to perform stated
     duties, willful violation of any law, rule or regulation (other than
     traffic violations or similar offenses) or final cease and desist order, or
     any material breach of this Agreement, in each case as measured against
     standards generally prevailing at the relevant time in the savings and
     community banking industry; provided, however, that such individual shall
     not be deemed to have been discharged for cause unless and until he shall
     have received a written notice of termination from the Board, which notice
     shall be given to such individual not later than five (5) business days
     after the board of directors of the Employer adopts, and shall be
     accompanied by, a resolution duly approved by affirmative vote of a
     majority of the entire board of directors of the Employer at a meeting
     called and held for such purpose (which meeting shall be held not less than
     fifteen (15) days nor more than thirty (30) days after notice to the
     individual), at which meeting there shall be a reasonable opportunity for
     the individual to make oral and written presentations to the members of the
     board of directors of the Employer, on his own behalf, or through a repre
     sentative, who may be his legal counsel, to refute the grounds for the
     proposed determination) finding that in the good faith opinion of the board
     of directors of the Employer grounds exist for discharging the individual
     for cause.

          (c) with respect to an Eligible Director, "Termination for Cause"
     shall be determined in accordance with the applicable Employer's Bylaws.

                                      -6-
<PAGE>
 
                                  ARTICLE III
                                  -----------

                                AVAILABLE SHARES
                                ----------------

           SECTION 3.1   AVAILABLE SHARES.
                         ---------------- 

          (a) Subject to section 8.3, the maximum aggregate number of Shares
with respect to which Options may be granted at any time shall be 208,855
Shares. Such Shares may be authorized and unissued shares, treasury shares, or
shares previously issued and reacquired by the Company.

          (b) For purposes of this section 3.1, an Option shall not be
considered as having been exercised to the extent that such Option terminates by
reason other than the purchase of related Shares; provided, however, that for
purposes of meeting the requirements of section 162(m) of the Code, no Eligible
Employee who is a covered employee under section 162(m) of the Code shall
receive a grant of Options in excess of 146,198 Shares, computed as if any
Option which is canceled reduced the maximum number of Shares.

          (c) Any Shares subject to awards under the Plan which are terminated,
expire, forfeited or are canceled without having been exercised in full, shall
again be available for grant under the Plan.

                                  ARTICLE IV
                                  ----------

                                ADMINISTRATION
                                --------------

          SECTION 4.1    PLAN ADMINISTRATORS.
                         ------------------- 

          The Plan shall be administered by the Board of Directors of the Bank
or by a committee of such Board consisting of three or more directors to whom
administration of the Plan has been delegated by resolution of such Board and
none of whom are eligible to receive Options under the Plan except as provided
in section 5.1. Actions of the Plan Administrators shall be taken by majority
vote or by unanimous written consent. All Plan Administrators shall be
Disinterested Board Members.

           SECTION 4.2   PLAN ADMINISTRATORS' ACTION.
                         --------------------------- 

          The Plan Administrators shall hold such meetings, and may make such
administrative rules and regulations, as it may deem proper.  All actions of the
Plan Administrators shall be final and conclusive and shall be binding upon the
Employer and all other interested parties.  Any Person dealing with the Plan
Administrators shall be fully protected in 

                                      -7-
<PAGE>
 
relying upon any written notice, instruction, direction or other communication
signed by the secretary of the Plan Administrators and one of the Plan
Administrators, by two Plan Administrators or by a representative of the Plan
Administrators authorized to sign the same in their behalf.

          SECTION 4.3    PLAN ADMINISTRATORS' AUTHORITY.
                         ------------------------------ 

          Subject to the provisions of the Plan, and with a view to effecting
its purpose, the Plan Administrators shall have sole authority, in their
absolute discretion with respect to Options, (a) to construe and interpret the
Plan; (b) to define the terms used herein; (c) to prescribe, amend, and rescind
rules and regulations relating to the Plan; (d) to determine, based upon
criteria to be established by the Plan Administrators, the individual employees
to whom Options shall be granted under the Plan; (e) to determine the time or
times at which Options shall be granted to employees under the Plan; (f) to
determine the number of Shares subject to each Option, the Exercise Price and
the duration of each Option granted under the Plan; and (g) to determine all of
the other terms and conditions of Options granted under the Plan.  The Plan
Administrators shall have the authority and discretion to prescribe forms for
the operation and administration of the Plan and to take other action not
inconsistent with the provisions of the Plan that may be deemed necessary or
appropriate.  All decisions, determinations and interpretations made by the Plan
Administrators shall be binding and conclusive on all participants in the Plan
and on their legal representatives, heirs and beneficiaries.

                                   ARTICLE V
                                   ---------

                     STOCK OPTIONS FOR ELIGIBLE DIRECTORS
                     ------------------------------------

          SECTION 5.1    IN GENERAL.
                         ---------- 

          (a) An aggregate of 62,657 Shares shall be reserved for the issuance
of Options to Eligible Directors under this Plan. In no event shall any Eligible
Director be granted Options to purchase more than an aggregate of 3,000 Shares
at any time hereunder.

          (b) Any Option granted under this section 5.1 shall be evidenced by a
written agreement which shall:

               (i)   specify the number of Shares covered by the Option;

               (ii)  specify the Exercise Price, determined in accordance with
     section 5.2, for the Shares subject to the Option;

                                      -8-
<PAGE>
 
               (iii) specify the Option Period determined in accordance with
     section 5.3;

               (iv)  set forth specifically or incorporate by reference the
     applicable provisions of the Plan; and

               (v)   contain such other terms and conditions not inconsistent
     with the Plan as the Plan Administrators may, in their discretion,
     prescribe with respect to an Option granted to an Eligible Director.


          SECTION 5.2    EXERCISE PRICE.
                         -------------- 

          The Exercise Price for an Option granted to an Eligible Director shall
be the Fair Market Value of a Share on the date on which the Option is granted.

          SECTION 5.3    OPTION PERIOD.
                         ------------- 

          Subject to section 5.4, the Option Period during which an Option
granted to an Eligible Director under section 5.1 may be exercised shall
commence on the date the Option is granted and shall expire on the earlier of:

            (a) the date of the Eligible Director's Termination for Cause;

            (b) the close of business on the last day of the one-year period
     commencing on the date of the Eligible Director's termination of service
     due to death, Disability or Retirement; or

            (c) the last day of the ten-year period commencing on the date on
     which the Option was granted.
 

          SECTION 5.4    VESTING OF OPTIONS.
                         ------------------ 

          The Plan Administrators, in their sole discretion, shall determine, at
the time an Option is granted to an Eligible Director, the date or dates upon
which all or a portion of the Option shall vest and become exercisable and such
date or dates shall constitute the Option's vesting schedule; provided, however,
that each Option granted hereunder shall automatically become 100% vested and
fully exercisable in the event of an Option holder's death, Disability or
Retirement or in the event of a Change in Control.  In the event the Plan
Administrators provide for an Option to vest and become exercisable in
installments, the Shares comprising each installment may be purchased,

                                      -9-
<PAGE>
 
in whole or in part, by the Eligible Director at any time after such installment
has become exercisable. The vesting schedule applicable to an Option granted to
an Eligible Director shall be specified in the Option agreement issued to such
Eligible Director and the vesting schedules applicable to Options granted to
Eligible Directors under this Plan may differ from one another provided that all
vesting schedules applicable to all Options granted hereunder shall not be
inconsistent with the terms and provisions of this Plan.
 
                                   ARTICLE VI
                                   ----------

                     STOCK OPTIONS FOR ELIGIBLE EMPLOYEES
                     ------------------------------------

          SECTION 6.1    SIZE OF OPTION.
                         -------------- 

          Subject to section 6.2 and such limitations as the Board may from time
to time impose, the number of Shares as to which an Eligible Employee may be
granted Options shall be determined by the Plan Administrators, in their
discretion. The maximum number of Shares that may be optioned to any one
individual under this Plan during its entire duration shall be the entire number
of Shares available under section 3.1(b) of the Plan.

           SECTION 6.2   GRANT OF OPTIONS.
                         ---------------- 

          (a) Subject to the limitations of the Plan, the Plan Administrators
may, in their discretion, grant to an Eligible Employee an Option to purchase
Shares.  An Option granted to an Eligible Employee shall be designated as either
an Incentive Stock Option or a Non-Qualified Stock Option and, if not designated
as either, shall be a Non-Qualified Stock Option.

          (b) Any Option granted under this section 6.2 shall be evidenced by a
written Option agreement which shall:

               (i) specify the number of Shares covered by the Option;

               (ii) specify whether it is an Incentive Stock Option or a Non-
     Qualified Stock Option, or both;

               (iii) specify the Exercise Price, determined in accordance with
     section 6.3, for the Shares subject to the Option;

               (iv) specify the Option Period determined in accordance with
     section 6.4;

                                      -10-
<PAGE>
 
               (v) set forth specifically or incorporate by reference the
     applicable provisions of the Plan; and

               (vi) contain such other terms and conditions not inconsistent
     with the Plan as the Plan Administrators may, in their discretion,
     prescribe with respect to an Option granted to an Eligible Employee.

          SECTION 6.3    EXERCISE PRICE.
                         -------------- 

          The Exercise Price for an Option granted to an Eligible Employee shall
be determined by the Plan Administrators, in their discretion; provided,
however, that the Exercise Price shall not be less than the Fair Market Value of
a Share on the date on which the Option is granted.

          SECTION 6.4    OPTION PERIOD.
                         ------------- 

          Subject to section 6.5, the Option Period during which an Option
granted to an Eligible Employee may be exercised shall commence on the date
specified by the Plan Administrators in the Option agreement and shall expire on
the date specified in the Option agreement or, if no date is specified, on the
earliest of:

          (a) the close of business on the last day of the three-month period
     commencing on the date of the Eligible Employee's termination of employment
     with the Employer, other than on account of death or Disability, Retirement
     or a Termination for Cause;

          (b) the close of business on the last day of the one-year period
     commencing on the date of the Eligible Employee's termination of employment
     due to death, Disability or Retirement;

          (c) the date and time when the Eligible Employee ceases to be an
     employee of the Employer due to a Termination for Cause; and

          (d) the last day of the ten-year period commencing on the date on
     which the Option was granted.

          SECTION 6.5    VESTING OF OPTIONS.
                         ------------------ 

          (a) Subject to the special requirements applicable to Incentive Stock
Options set forth in section 6.6 hereof, the Plan Administrators, in their sole
discretion, shall determine, at the time an Option is granted to an Eligible
Employee, the date or dates upon which all or a portion of 

                                      -11-
<PAGE>
 
such Option shall vest and become exercisable and such date or dates shall
constitute the Option's vesting schedule; provided, however, that each Option
granted hereunder shall automatically become 100% vested and fully exercisable
in the event of the Option holder's death, Disability or Retirement or in the
event of a Change in Control. In the event the Plan Administrators provide for
an Option to vest and become exercisable in installments, the Shares comprising
each installment may be purchased, in whole or in part, by the Eligible Employee
at any time after such installment has become exercisable. The vesting schedule
applicable to an Option granted to an Eligible Employee shall be specified in
the Option agreement issued to such Employee and the vesting schedules
applicable to Options granted to Eligible Employees under this Plan may differ
from one another provided that all vesting schedules applicable to all Options
granted hereunder shall not be inconsistent with the terms and conditions of
this Plan.

          (b) The Option Period of any Option granted to an Eligible Employee
hereunder, whether or not previously vested, shall be suspended as of the time
and date at which the Option holder has received notice from the Board that his
or her employment is subject to a possible Termination for Cause.  Such
suspension shall remain in effect until the Option holder receives official
notice from the Board that he or she has been cleared of any possible
Termination for Cause, at which time, the original Exercise Period shall be
reinstated without any adjustment for the intervening suspended period.  In the
event that the Option Period under section 6.4 expires during such suspension,
the Company shall pay to the Eligible Employee, within 30 days after his
reinstatement as an employee of the Company, damages equal to the value of the
expired Options less the Exercise Price of such Options.

          (c) No Option granted to an Eligible Employee hereunder, whether or
not previously vested, shall be exercised after the time and date at which the
Option holder's employment with the Employer is terminated in a Termination for
Cause.

          SECTION 6.6    ADDITIONAL RESTRICTIONS ON INCENTIVE STOCK OPTIONS.
                         -------------------------------------------------- 

          In addition to the limitations of section 7.2, an Option granted to an
Eligible Employee designated by the Plan Administrators to be an Incentive Stock
Option shall be subject to the following limitations:

          (a) If, for any calendar year, the sum of (i) plus (ii) exceeds
     $100,000, where (i) equals the Fair Market Value (determined as of the date
     of the grant) of Shares subject to an Option intended to be an Incentive
     Stock Option which first become available for purchase during such calendar
     year, and (ii) equals the Fair Market Value (determined as of the date of
     grant) of Shares subject to any other options intended to be Incentive
     Stock Options and previously granted to the same Eligible Employee which
     first become exercisable in such calendar year, then that number of Shares
     optioned which causes the sum of (i) and (ii) to exceed $100,000 

                                      -12-
<PAGE>
 
     shall be deemed to be Shares optioned pursuant to a Non-Qualified Stock
     Option or Non-Qualified Stock Options, with the same terms as the Option or
     Options intended to be an Incentive Stock Option;

          (b) The Exercise Price of an Incentive Stock Option granted to an
     Eligible Employee who, at the time the Option is granted, owns Shares
     comprising more than 10% of the total combined voting power of all classes
     of stock of the Company shall not be less than 110% of the Fair Market
     Value of a Share, and if an Option designated as an Incentive Stock Option
     shall be granted at an Exercise Price that does not satisfy this
     requirement, the designated Exercise Price shall be observed and the Option
     shall be treated as a Non-Qualified Stock Option;

          (c) The Option Period of an Incentive Stock Option granted to an
     Eligible Employee who, at the time the Option is granted, owns Shares
     comprising more than 10% of the total combined voting power of all classes
     of stock of the Company, shall expire no later than the fifth anniversary
     of the date on which the Option was granted, and if an Option designated as
     an Incentive Stock Option shall be granted for an Option Period that does
     not satisfy this requirement, the designated Option Period shall be
     observed and the Option shall be treated as a Non-Qualified Stock Option;

          (d) An Incentive Stock Option that is exercised during its designated
     Option Period but more than:

               (i) three (3) months after the termination of employment with the
          Company, a parent or a subsidiary (other than on account of disability
          within the meaning of section 22(e)(3) of the Code or death) of the
          Eligible Employee to whom it was granted; and

               (ii) one (1) year after such individual's termination of
          employment with the Company, a parent or a subsidiary due to
          disability (within the meaning of section 22(e)(3) of the Code);

     may be exercised in accordance with the terms but shall at the time of
     exercise be treated as a Non-Qualified Stock Option; and

          (e) Except with the prior written approval of the Plan Administrators,
     no individual shall dispose of Shares acquired pursuant to the exercise of
     an Incentive Stock Option until after the later of (i) the second
     anniversary of the date on which the Incentive Stock Option was granted, or
     (ii) the first anniversary of the date on which the Shares were acquired.

                                      -13-
<PAGE>
 
                                  ARTICLE VII
                                  -----------

                             OPTIONS -- IN GENERAL
                             ---------------------

           SECTION 7.1   METHOD OF EXERCISE.
                         ------------------ 

          (a) Subject to the limitations of the Plan and the Option agreement,
an Option holder may, at any time during the Option Period, exercise his or her
right to purchase all or any part of the Shares to which the Option relates;
provided, however, that the minimum number of Shares which may be purchased at
any time shall be 100, or, if less, the total number of Shares relating to the
Option which remain unpurchased.  An Option holder shall exercise an Option to
purchase Shares by:

               (i) giving written notice to the Plan Administrators, in such
     form and manner as the Plan Administrators may prescribe, of his intent to
     exercise the Option;

               (ii) delivering to the Plan Administrators full payment,
     consistent with section 7.1(b), for the Shares as to which the Option is to
     be exercised; and

               (iii) satisfying such other conditions as may be prescribed in
     the Option agreement.

          (b) The Exercise Price of Shares to be purchased upon exercise of any
Option shall be paid in full in cash (by certified or bank check or such other
instrument as the Company may accept) or, if and to the extent permitted by the
Plan Administrators, by one or more of the following: (i) in the form of Shares
already owned by the Option holder having an aggregate Fair Market Value on the
date the Option is exercised equal to the aggregate Exercise Price to be paid;
(ii) by requesting the Company to cancel without payment Options outstanding to
such Person for that number of Shares whose aggregate Fair Market Value on the
date of exercise, when reduced by their aggregate Exercise Price, equals the
aggregate Exercise Price of the Options being exercised; or (iii) by a
combination thereof.  Payment for any Shares to be purchased upon exercise of an
Option may also be made by delivering a properly executed exercise notice to the
Company, together with a copy of irrevocable instructions to a broker to deliver
promptly to the Company the amount of sale or loan proceeds to pay the purchase
price. To facilitate the foregoing, the Company may enter into agreements for
coordinated procedures with one or more brokerage firms.

          (c) When the requirements of section 7.1(a) and (b) have been
satisfied, the Plan Administrators shall take such action as is necessary to
cause the issuance of a stock certificate evidencing the Option holder's
ownership of such Shares.  The Person exercising the Option shall 

                                      -14-
<PAGE>
 
have no right to vote or to receive dividends, nor have any other rights with
respect to the Shares, prior to the date as of which such Shares are transferred
to such Person on the stock transfer records of the Company, and no adjustments
shall be made for any dividends or other rights for which the record date is
prior to the date as of which such transfer is effected, except as may be
required under section 8.3.

          SECTION 7.2    LIMITATIONS ON OPTIONS.
                         ---------------------- 

          (a) Subject to the last sentence in this section 7.2(a), an Option by
its terms shall not be transferable by the Option holder other than to Family
Members or Non-profit Organizations or by will or by the laws of descent and
distribution and shall be exercisable, during the lifetime of the Option holder,
only by the Option holder, a Family Member or a Non-profit Organization.  Any
such transfer shall be effected by written notice to the Company given in such
form and manner as the Plan Administrators may prescribe and shall be recognized
only if such notice is received by the Company prior to the death of the person
giving it.  Thereafter, the transferee shall have, with respect to such Option,
all of the rights, privileges and obligations which would attach thereunder to
the transferor if the Option were issued to such transferor.  If a privilege of
the Option depends on the life, employment or other status of the transferor,
such privilege of the Option for the transferee shall continue to depend on the
life, employment or other status of the transferor.  The Plan Administrators
shall have full and exclusive authority to interpret and apply the provisions of
this Plan to transferees to the extent not specifically described herein.
Notwithstanding the foregoing, an Option that is not intended to be an Incentive
Stock Option shall not be transferable by an Eligible Employee other than by
will or the laws of descent and distribution, and is exercisable, during his
lifetime, solely by him.

          (b) The Company's obligation to deliver Shares with respect to an
Option shall, if the Plan Administrators so request, be conditioned upon the
receipt of a representation as to the investment intention of the Option holder
to whom such Shares are to be delivered, in such form as the Plan Administrators
shall determine to be necessary or advisable to comply with the provisions of
applicable federal, state or local law.  It may be provided that any such
representation shall become inoperative upon a registration of the Shares or
upon the occurrence of any other event eliminating the necessity of such
representation.  The Company shall not be required to deliver any Shares under
the Plan prior to (i) the admission of such Shares to listing on any stock
exchange on which Shares may then be listed, or (ii) the completion of such
registration or other qualification under any state or federal law, rule or
regulation as the Plan Administrators shall determine to be necessary or
advisable.

                                      -15-
<PAGE>
 
                                 ARTICLE VIII
                                 ------------

                           AMENDMENT AND TERMINATION
                           -------------------------

          SECTION 8.1    TERMINATION.
                         ----------- 

          The Board may suspend or terminate the Plan in whole or in part at any
time prior to the tenth anniversary of the Effective Date by giving written
notice of such suspension or ter  mination to the Plan Administrators.  Unless
sooner terminated, the Plan shall terminate automatically on the day preceding
the tenth anniversary of the Effective Date.  In the event of any suspension or
termination of the Plan, all Options theretofore granted under the Plan that are
outstanding on the date of such suspension or termination of the Plan shall
remain outstanding and exercisable for the period and on the terms and
conditions set forth in the Option agreements evidencing such Options.

          SECTION 8.2    AMENDMENT.
                         --------- 

          The Board may amend or revise the Plan in whole or in part at any
time; provided, however, that, to the extent required to comply with section
162(m) of the Code, no such amendment or revision shall be effective if it
amends a material term of the Plan unless approved by the holders of a majority
of the voting shares of New Hampshire Thrift Bancshares, Inc.; and provided,
further, that no such amendment shall result in non-compliance with any
applicable OTS Regulation.

          SECTION 8.3    ADJUSTMENTS IN THE EVENT OF A BUSINESS REORGANIZATION.
                         ----------------------------------------------------- 

          (a) In the event of any merger, consolidation, or other business
reorganization in which the Company is the surviving entity, and in the event of
any stock split, stock dividend or other event generally affecting the number of
Shares held by each Person who is then a holder of record of Shares, the number
of Shares covered by each outstanding Option and the number of Shares available
pursuant to section 3.1 shall be adjusted to account for such event.  Such
adjust  ment shall be effected by multiplying such number of Shares by an amount
equal to the number of Shares that would be owned after such event by a Person
who, immediately prior to such event, was the holder of record of one Share, and
the Exercise Price of the Options shall be adjusted by dividing the Exercise
Price by such number of Shares; provided, however, that the Plan Administrators
may, in its discretion, establish another appropriate method of adjustment.

          (b) In the event of any merger, consolidation, or other business
reorganization in which the Company is not the surviving entity, any Options
granted under the Plan which remain outstanding, whether or not exercisable, may
be canceled as of the effective date of such merger, consolidation, business
reorganization, liquidation or sale by the Board upon 30 days' 

                                      -16-
<PAGE>
 
written notice to the Option holder; provided, however, that on or as soon as
practicable following the date of cancellation, each Option holder shall receive
a monetary payment in such amount, or other property of such kind and value, as
the Board determines in good faith to be equivalent in value to the Options that
have been canceled.

          (c) In the event that the Company shall declare and pay any dividend
with respect to Shares (other than a dividend payable in Shares) which results
in a nontaxable return of capital to the holders of Shares for federal income
tax purposes or otherwise than by dividend makes distribution of property to the
holders of its Shares, the Company shall, in the discretion of the Plan
Administrators, either:

               (i) make an equivalent payment to each Person holding an
     outstanding Option as of the record date for such dividend. Such payment
     shall be made at substantially the same time, in substantially the same
     form and in substantially the same amount per optioned Share as the
     dividend or other distribution paid with respect to outstanding Shares;
     provided, however, that if any dividend or distribution on outstanding
     Shares is paid in property other than cash, the Company, in the Plan
     Administrators' discretion, may make such payment in a cash amount per
     optioned Share equal in fair market value to the fair market value of the
     non-cash dividend or distribution; or

               (ii) adjust the Exercise Price of each outstanding Option in such
     manner as the Plan Administrators may determine to be appropriate to
     equitably reflect the payment of the dividend; or

               (iii) take the action described in section 8.3(c)(i) with respect
     to certain outstanding Options and the action described in section
     8.3(c)(ii) with respect to the remaining outstanding Options.

                                  ARTICLE IX
                                  ----------

                                 MISCELLANEOUS
                                 -------------

          SECTION 9.1    STATUS AS AN EMPLOYEE BENEFIT PLAN.
                         ---------------------------------- 

          This Plan is not intended to satisfy the requirements for
qualification under section 401(a) of the Code or to satisfy the definitional
requirements for an "employee benefit plan" under section 3(3) of the Employee
Retirement Income Security Act of 1974, as amended.  It is intended to be a non-
qualified incentive compensation program that is exempt from the regulatory
requirements of the Employee Retirement Income Security Act of 1974, as amended.
The Plan shall be construed and administered so as to effectuate this intent.

                                      -17-
<PAGE>
 
          SECTION 9.2    NO RIGHT TO CONTINUED EMPLOYMENT.
                         -------------------------------- 

          Neither the establishment of the Plan nor any provisions of the Plan
nor any action of the Board or the Plan Administrators with respect to the Plan
shall be held or construed to confer upon any Eligible Director or Eligible
Employee any right to a continuation of his or her position as a director or
employee of the Company.  The Employers reserve the right to remove any Eligible
Director or dismiss any Eligible Employee or otherwise deal with any Eligible
Director or Eligible Employee to the same extent as though the Plan had not been
adopted.

          SECTION 9.3    CONSTRUCTION OF LANGUAGE.
                         ------------------------ 

          Whenever appropriate in the Plan, words used in the singular may be
read in the plural, words used in the plural may be read in the singular, and
words importing the masculine gender may be read as referring equally to the
feminine or the neuter.  Any reference to an Article or section number shall
refer to an Article or section of this Plan unless otherwise indicated.

          SECTION 9.4    GOVERNING LAW.
                         ------------- 

          The Plan shall be construed, administered and enforced according to
the laws of the State of New Hampshire without giving effect to the conflict of
laws principles thereof, except to the extent that such laws are preempted by
federal law.  The Plan shall be construed to comply with applicable OTS
Regulations.

          SECTION 9.5    HEADINGS.
                         -------- 

          The headings of Articles and sections are included solely for
convenience of reference.  If there is any conflict between such headings and
the text of the Plan, the text shall control.

          SECTION 9.6    NON-ALIENATION OF BENEFITS.
                         -------------------------- 

          The right to receive a benefit under the Plan shall not be subject in
any manner to anticipation, alienation or assignment, nor shall such right be
liable for or subject to debts, contracts, liabilities, engagements or torts,
except to the extent provided in a qualified domestic relations order as defined
in section 414(p) of the Code.

          SECTION 9.7    TAXES.
                         ----- 

          The Company shall have the right to deduct from all amounts paid by
the Company in cash with respect to an Option under the Plan any taxes required
by law to be withheld with 

                                      -18-
<PAGE>
 
respect to such Option. Where any Person is entitled to receive Shares pursuant
to the exercise of an Option, the Company shall have the right to require such
Person to pay the Company the amount of any tax which the Company is required to
withhold with respect to such Shares, or, in lieu thereof, to retain, or to sell
without notice, a sufficient number of Shares to cover the amount required to be
withheld.

          SECTION 9.8    APPROVAL OF SHAREHOLDERS.
                         ------------------------ 

          (a) The Plan shall not be effective or implemented unless the Plan is
approved by a majority of shareholders of the Company voting in person or by
proxy at a duly held shareholders' meeting. The Plan shall be effective as of
the date of such approval.

          (b) No Option shall be granted prior to shareholder approval of the
Plan.

          SECTION 9.9    NOTICES.
                         ------- 

          Any communication required or permitted to be given under the Plan,
including any notice, direction, designation, comment, instruction, objection or
waiver, shall be in writing and shall be deemed to have been given at such time
as it is delivered personally or five (5) days after mailing if mailed, postage
prepaid, by registered or certified mail, return receipt requested, addressed to
such party at the address listed below, or at such other address as one such
party may by written notice specify to the other party:

          (a)  If to the Plan Administrators:

               New Hampshire Thrift Bancshares, Inc.
               9 Main Street, P.O. Box 29
               Newport, NH 03773-0029
               Attention:     Corporate Secretary
                              -------------------

               with a copy to:
 
               Thacher Proffitt & Wood
               1500 K Street, NW, Suite 200
               Washington, DC 20005

               Attention:     Richard A. Schaberg, Esq.
                              -------------------------
 
          (b) If to an Option holder, to the Option holder's address as shown in
the Employer's records.

                                      -19-
<PAGE>
 
                                   ARTICLE X
                                   ---------

                                THE TRUST FUND
                                --------------

          SECTION 10.1   ESTABLISHMENT OF A TRUST.
                         ------------------------ 

          The Company may, in its sole and absolute discretion, establish a
trust for use in connection with the Options granted under this Plan.  In the
event the Company establishes a trust, it shall contribute, or cause to be
contributed, from time to time, such amounts of money or property, which may
include Shares, as shall be determined by the Company's Board of Directors, in
its discretion. Upon the establishment of such trust, the Plan Administrators
shall determine the rights, if any, which an Option holder shall have with
respect to the Shares held in the trust.  Any and all such rights shall be
specified in the Option agreement issued to such Option holder.

          SECTION 10.2   THE TRUST FUND.
                         -------------- 

          The assets held in the trust established by the Company shall
constitute a "trust fund" which shall be held and invested pursuant to a written
trust agreement to be entered into between the Company and a trustee.  The terms
of the trust agreement shall include provisions conferring powers on the trustee
as to investment, control and disbursement of the Trust Fund, and such other
provisions not inconsistent with the Plan or any Option agreement, or as may be
prescribed by or under the authority of the Company's Board of Directors.  No
bond or security shall be required of any trustee at any time in office.

          SECTION 10.3   INVESTMENTS OF THE TRUST FUND.
                         ----------------------------- 

          In the event a trust is established hereunder, the trustee shall
invest the trust fund in Shares and in such other investments as may be
permitted under the trust agreement, including savings accounts, time or other
interest bearing deposits in or other interest bearing obligations of the Bank,
in such proportions as shall be determined by the Plan Administrators; provided,
however, that in no event shall the trust fund be used to purchase more than Two
Hundred and Eight Thousand Eight Hundred Fifty-Five (208,855) Shares or such
other amount as may be specified in section 3.1 hereof.  Notwithstanding the
immediately preceding sentence, the trustee may temporarily invest the trust
fund in short-term obligations of, or guaranteed by, the U.S. Government or an
agency thereof, or the trustee may retain the trust fund uninvested or may sell
assets of the trust fund to provide amounts required for purposes of the Plan.

          The Company may, in its sole and absolute discretion, establish a
trust for use in connection with certain of the Options granted under this Plan.
In the event the Company establishes a trust, it shall contribute, or cause to
be contributed,  from time to time, such amounts of money or property, which may
include Shares, as shall be determined by the Company's Board 

                                      -20-
<PAGE>
 
of Directors, in its discretion. Upon the establishment of such trust, the Plan
Administrators shall determine the rights, if any, which an Option holder shall
have with respect to the Shares held in the trust. Any and all such rights shall
be specified in the Option agreement issued to such Option holder.

                                      -21-

<PAGE>
                                                                     EXHIBIT 4.2
 

                                    FORM OF
          NEW HAMPSHIRE THRIFT BANCSHARES, INC. 1998 STOCK OPTION PLAN
                             STOCK OPTION AGREEMENT
                             ----------------------

- -------------------------------------    ---------------------------------------
         Name of Optionee                          Social Security Number


- --------------------------------------------------------------------------------
                                 Street Address

- -------------------------------------------    -----------    ------------------
                    City                          State             ZIP Code

          This Stock Option Agreement is intended to set forth the terms and
conditions on which an Stock Option has been granted under the New Hampshire
Thrift Bancshares, Inc. 1998 Stock Option Plan.  Set forth below are the
specific terms and conditions applicable to this Stock Option.  Attached as
Exhibit A are its general terms and conditions.

<TABLE>
<CAPTION>

================================================================================
Option Grant                   (A)      (B)      (C)      (D)      (E)
================================================================================
<S>                          <C>      <C>      <C>      <C>      <C>
ISO or NQSO
- --------------------------------------------------------------------------------
Grant Date:
- --------------------------------------------------------------------------------
Class of Optioned Shares*    Common   Common   Common   Common   Common
- --------------------------------------------------------------------------------
No. of Optioned Shares*
- --------------------------------------------------------------------------------
Exercise Price Per Share*
- --------------------------------------------------------------------------------
VESTING
- --------------------------------------------------------------------------------
Earliest Exercise Date*
- --------------------------------------------------------------------------------
Option Expiration Date*
================================================================================
</TABLE>

*Subject to adjustment as provided in the Plan and the General Terms and
Conditions.

By signing where indicated below, the Company grants this Stock Option upon the
specified terms and conditions, and the Optionee acknowledges receipt of this
Stock Option Agreement, including Exhibit A, and agrees to observe and be bound
by the terms and conditions set forth herein.

NEW HAMPSHIRE THRIFT BANCSHARES, INC.                   OPTIONEE


By
   -----------------------------------          --------------------------------
          Name:
                ----------------------
          Title:
                ----------------------

- --------------------------------------------------------------------------------
INSTRUCTIONS:  This page should be completed by or on behalf of the Plan
Administrators.  Any blank space intentionally left blank should be crossed out.
An option grant consists of a number of optioned shares with uniform terms and
conditions.  Where options are granted on the same date with varying terms and
conditions (for example, varying exercise prices or earliest exercise dates),
the options should be recorded as a series of grants each with its own uniform
terms and conditions.


<PAGE>
 
                                                                       EXHIBIT A
                                                                       ---------
          NEW HAMPSHIRE THRIFT BANCSHARES, INC. 1998 STOCK OPTION PLAN
                             STOCK OPTION AGREEMENT
                             ----------------------

                          GENERAL TERMS AND CONDITIONS


          SECTION 1.  INCENTIVE STOCK OPTION.  If indicated, and only if
                      ----------------------                            
indicated, the Company intends the Option evidenced hereby to be an "incentive
stock option" within the meaning of section 422 of the Internal Revenue Code of
1986.  Options granted to outside directors will not be incentive stock options.

          SECTION 2.  OPTION PERIOD.  (a)  Subject to section 2(b), the Optionee
                      -------------                                             
shall have the right to purchase all or any portion of the optioned Common Stock
at any time during the period ("Option Period") commencing on the Earliest
Exercise Date and ending on the earliest to occur of the following dates:

          (i)   the last day of the ten-year period commencing on the Grant 
                Date;
     
          (ii)  the last day of the three-month period commencing on the date of
     the Optionee's termination of service with the Company other than for
     death, permanent and total disability within the meaning of section
     22(e)(3) of the Code ("Disability") or Termination for Cause (as defined in
     any service agreement with the Company) or if the Optionee dies or becomes
     permanently disabled within three (3) months after his or her termination
     of service, the last day of twelve-month period commencing on the date of
     death of the date of Disability;

          (iii) the last day of the twelve-month period commencing on the date
     of the Optionee's termination of service with the Company by reason of
     death or Disability;

          (iv)  the date the Optionee ceases to provide services for the Company
     due to a Termination for Cause;

          (v)   if the option is an incentive stock option and if, as of the
     date of this grant, the Optionee owns Common Stock comprising more than 10%
     of the total combined voting power of all classes of stock of the Company,
     the last day of the five-year period commencing on the Grant Date.

          (b)   Upon the termination of the Optionee's service with the Company,
any Option granted hereunder for which the Earliest Exercise Date has not
occurred is deemed forfeited.


          SECTION 3.  EXERCISE PRICE.  During the Option Period, the Optionee
                      --------------                                         
shall have the right to purchase all or any portion of the Optioned Common Stock
at the Exercise Price per Share.

          SECTION 4.  METHOD OF EXERCISE.  The Optionee may, at any time during
                      ------------------                                       
the Option Period provided by section 2, exercise his right to purchase all or
any part of the optioned Common Stock then available for purchase; provided,
however, that the minimum number of shares of optioned Common Stock which may be
purchased shall be one hundred (100) or, if less, the total number of shares of
optioned Common Stock then available for purchase. The Optionee shall exercise
such right by:

          (a)   giving written notice to the Plan Administrator, in the form
     attached hereto as Appendix A; and

          (b)   delivering to the Plan Administrator full payment of the 
     Exercise Price for the Optioned Shares to be purchased.

The date of exercise shall be the earliest date practicable following the date
the requirements of this section 4 have been satisfied, but in no event more
than three (3) days after such date.  Payment shall be made (i) in United States
dollars by certified check, money order or bank draft made payable to the order
of New Hampshire Thrift Bancshares, Inc., (ii) in Shares duly endorsed for
transfer and with all necessary stock transfer tax stamps attached, already
owned by the Optionee and having a fair market value equal to the Exercise
Price, such fair market value to be determined in such manner as may be provided
by the Plan Administrator or the Administrator or as may be required in order to
comply with or conform to the requirements of any applicable laws or
regulations, or (iii) in a combination of (i) and (ii).  In the event that an
Optionee shall exercise his or her option in whole or in part with Common Stock
previously acquired 

                                      -2-
<PAGE>
 
through the exercise of an incentive stock option, all such shares shall have
been held by the Optionee for the applicable periods provided by section 422(a)
of the Code prior to their tender to the Company in the exercise of such option.

          SECTION 5.  DELIVERY AND REGISTRATION OF OPTIONED SHARES.  As soon as
                      --------------------------------------------             
is practicable following the date on which the Optionee has satisfied the
requirements of section 4, the Plan Administrators shall take such action as is
necessary to cause the Company to issue a stock certificate evidencing the
Optionee's ownership of the optioned Common Stock that have been purchased.  The
Optionee shall have no right to vote nor have any other rights with respect to
optioned Common Stock, prior to the date as of which such optioned Common Stock
are transferred to the Optionee on the stock transfer records of the Company,
and no adjustments shall be made for any dividends or other rights for which the
record date is prior to the date as of which such transfer is effected.  The
obligation of the Company to deliver Common Stock under this Agreement shall, if
the Plan Administrators so request, be conditioned upon the receipt of a
representation as to the investment intention of the Optionee to whom such
Common Stock is to be delivered, in such form as the Plan Administrator shall
determine to be necessary or advisable to comply with the provisions of
applicable federal, state or local law.  It may be provided that any such
representation shall become inoperative upon a registration of the Common Stock
or upon the occurrence of any other event eliminating the necessity of such
representation.  The Company shall not be required to deliver any Common Stock
under this Agreement prior to (a) the admission of such Common Stock to listing
on any stock exchange on which Common Stock may then be listed, or (b) the
completion of such registration or other qualification under any state or
federal law, rule or regulations as the Plan Administrators shall determine to
be necessary or advisable.

          SECTION 6.  RESTRICTIONS ON GRANT AND SALE.  (a)  In the case of an
                      ------------------------------                         
incentive stock option, if, for any calendar year, the sum of (i) plus (ii)
exceeds $100,000, where (i) equals the Fair Market Value (determined as of the
date of the grant) of Common Stock subject to an option which first become
available for purchase during such calendar year, and (ii) equals the Fair
Market Value (determined as of the date of grant) of Common Stock subject to any
other Stock Options and previously granted to the same Optionee which first
become exercisable in such calendar year, then that portion of the Common Stock
subject to such options which causes the sum of (i) and (ii) to exceed $100,000
shall be deemed to be Common Stock granted pursuant to a non-qualified option,
with the same terms as the option or options intended to be an incentive stock
option;

          (b)   Except with the prior written approval of the Plan
Administrator, no individual shall dispose of Common Stock acquired pursuant to
the exercise of an incentive stock option until after the later of (i) the
second anniversary of the date on which the incentive stock option was granted,
or (ii) the first anniversary of the date on which the incentive stock option
was acquired; in effect, there is a one year holding period from the time of
exercise until the time of sale.

          SECTION 7.  ADJUSTMENTS IN THE EVENT OF REORGANIZATION.  In the event
                      ------------------------------------------               
of any merger, consolida tion, or other business reorganization in which the
Company is the surviving entity, and in the event of any stock split, stock
dividend or other event generally affecting the number of shares of Common Stock
held by each person who is then a shareholder of record, the number of shares of
Common Stock subject to the option granted hereunder and the Exercise Price per
share of such option shall be adjusted in accordance with section 8.3 of the
Plan to account for such event.  In the event of any merger, consolidation, or
other business reorganization in which the Company is not the surviving entity,
the option granted hereunder shall be accelerated and/or adjusted in accordance
with section 8.3 of the Plan.

          SECTION 8.  NO RIGHT TO CONTINUED EMPLOYMENT.  Nothing in this
                      --------------------------------                  
Agreement nor any action of the Board or Plan Administrators with respect to
this Agreement shall be held or construed to confer upon the Optionee any right
to a continuation of service with the Company.  The Optionee may be dismissed or
otherwise dealt with as though this Agreement had not been entered into.

          SECTION 9.  TAXES.  Where any person is entitled to receive shares
                      -----                                                 
pursuant to the exercise of the Option granted hereunder, the Company shall have
the right to require such person to pay to the Company the amount of any tax
which the Company is required to withhold with respect to such shares, or, in
lieu thereof, to retain, or to sell without notice, a sufficient number of
shares to cover the amount required to be withheld.

          SECTION 10.  NOTICES.  Any communication required or permitted to be
                       -------                                                
given under the Plan, including any notice, direction, designation, comment,
instruction, objection or waiver, shall be in writing and shall be deemed to
have been given at such time as it is delivered personally or five (5) days
after mailing if mailed, postage prepaid, by registered or certified mail,
return receipt requested, addressed to such party at the address listed below,
or at such other address as one such party may by written notice specify to the
other party:

                                      -3-
<PAGE>
 
          (a)   If to the Plan Administrators:

                New Hampshire Thrift Bancshares, Inc.
                9 Main Street
                Newport, New Hampshire  03773

                Attention:  Administrator of New Hampshire Thrift Bancshares,
                            Inc.
                            Stock Option Plan
                            -------------------------------------------------

          (b)   If to the Optionee, to the Optionee's address as shown in the
                Company's personnel records.

          SECTION 11.  RESTRICTIONS ON TRANSFER.  The option granted hereunder
                       ------------------------                               
shall not be subject in any manner to anticipation, alienation or assignment,
nor shall such option be liable for or subject to debts, contracts, liabil
ities, engagements or torts, nor shall it be transferable by the Optionee other
than to Family Members or Non-profit Organizations by will or by the laws of
descent and distribution.  During the lifetime of the Optionee, the option
granted hereunder shall be exercisable only by him.

          SECTION 12.  SUCCESSORS AND ASSIGNS.  This Agreement shall inure to
                       ----------------------                                
the benefit of and shall be binding upon the Company and the Optionee and their
respective heirs, successors and assigns.

          SECTION 13.  CONSTRUCTION OF LANGUAGE.  Whenever appropriate in the
                       ------------------------                              
Agreement, words used in the singular may be read in the plural, words used in
the plural may be read in the singular, and words importing the masculine gender
may be read as referring equally to the feminine or the neuter.  Any reference
to a section shall be a reference to a section of this Agreement, unless the
context clearly indicates otherwise.  Capitalized terms not speci  fically
defined herein shall have the meanings assigned to them under the Plan.

          SECTION 14.  GOVERNING LAW.  This Agreement shall be construed,
                       -------------                                     
administered and enforced according to the laws of the State of New Hampshire
without giving effect to the conflict of laws principles thereof, except to the
extent that such laws are preempted by the federal law.

          SECTION 15.  AMENDMENT.  This Agreement may be amended, in whole or in
                       ---------                                                
part and in any manner not inconsistent with the provisions of the Plan, at any
time and from time to time, by written agreement between the Company and the
Optionee.

          SECTION 16.  PLAN PROVISIONS CONTROL.  This Agreement and the rights
                       -----------------------                                
and obligations created hereunder shall be subject to all of the terms and
conditions of the Plan.  In the event of any conflict between the provisions of
the Plan and the provisions of this Agreement, the terms of the Plan, which are
incorporated herein by reference, shall control.  By signing this Agreement, the
Optionee acknowledges receipt of a copy of the Plan.

     SECTION 17.  CHANGE IN CONTROL.  In the event (i) of a "change in control"
                  -----------------                                            
as defined in the Plan or (ii) an agreement is reached for the dissolution,
liquidation, reorganization, merger, combination, consolidation or sale or
transfer of assets or stock in which provision is not made in the transaction,
prior to the receipt of regulatory approval of such transaction, for the
continuance of the Plan and for the assumption of options theretofore granted or
the substitution for those options of new options covering the stock of a
successor corporation or a parent or subsidiary thereof, the Optionee (or that
person's estate or a person who acquired the right to exercise the option from
the Optionee by bequest or inheritance) shall be entitled, to purchase, in whole
or in part, the full number of shares of Common Stock granted hereunder which he
or she would otherwise have been entitled to purchase during the remaining
Option Period and without regard to any otherwise applicable exercise
restrictions set forth herein.

                                      -4-
<PAGE>
 
                      APPENDIX A TO STOCK OPTION AGREEMENT
          NEW HAMPSHIRE THRIFT BANCSHARES, INC. 1998 STOCK OPTION PLAN
                       NOTICE OF EXERCISE OF STOCK OPTION

<TABLE> 
<CAPTION> 
- ----------------------------------------------------------------------------------------------------------------------------------- 
USE THIS NOTICE TO INFORM THE PLAN ADMINISTRATOR ADMINISTERING THE NEW HAMPSHIRE THRIFT BANCSHARES, INC. 1998 STOCK OPTION PLAN
("PLAN") THAT YOU ARE EXERCISING YOUR RIGHT TO PURCHASE SHARES OF COMMON STOCK ("SHARES") OF NEW HAMPSHIRE THRIFT BANCSHARES, INC.
(THE "COMPANY") PURSUANT TO AN OPTION ("OPTION") GRANTED UNDER THE PLAN. IF YOU ARE NOT THE PERSON TO WHOM THE OPTION WAS GRANTED
("OPTION RECIPIENT"), YOU MUST ATTACH TO THIS NOTICE PROOF OF YOUR RIGHT TO EXERCISE THE OPTION GRANTED UNDER THE STOCK OPTION
AGREEMENT ENTERED INTO BETWEEN THE COMPANY AND THE OPTION RECIPIENT ("AGREEMENT"). THIS NOTICE SHOULD BE PERSONALLY DELIVERED OR
MAILED BY CERTIFIED MAIL, RETURN RECEIPT REQUESTED TO: NEW HAMPSHIRE THRIFT BANCSHARES, INC., 9 MAIN STREET, NEWPORT, NEW HAMPSHIRE
03773 ATTENTION: PLAN ADMINISTRATOR. THE EFFECTIVE DATE OF THE EXERCISE OF THE OPTION SHALL BE THE EARLIEST DATE PRACTICABLE
FOLLOWING THE DATE THIS NOTICE IS RECEIVED BY THE COMPANY, BUT IN NO EVENT MORE THAN THREE DAYS AFTER SUCH DATE ("EFFECTIVE DATE").
EXCEPT AS SPECIFICALLY PROVIDED TO THE CONTRARY HEREIN, CAPITALIZED TERMS SHALL HAVE THE MEANINGS ASSIGNED TO THEM UNDER THE PLAN.
THIS NOTICE IS SUBJECT TO ALL OF THE TERMS AND CONDITIONS OF THE PLAN AND THE AGREEMENT.

OPTION INFORMATION Identify below the Option that you are exercising by providing the following information from the Stock Option
Agreement.
 
NAME OF OPTION RECIPIENT: _____________________________________________________
OPTION GRANT DATE:  ____________________, __________      EXERCISE PRICE PER SHARE:   $_________.____
                      (Month and Day)       (Year)
 
EXERCISE PRICE   Compute the Exercise Price below and select a method of payment.
 
 TOTAL EXERCISE PRICE  ________________      x     $__________.______ = $_______________
                        (No. of Shares)             (Exercise Price)     Total Exercise Price

<CAPTION>  
 METHOD OF PAYMENT
 <S>    <C> 
 [_]    I enclose a certified check, money order, or bank draft payable to the order of 
        Falmouth Bancorp, Inc. in the amount of                                                         $
                                                                                                         ---------------
 [_]    I enclose Shares duly endorsed for transfer to the Company with all stamps attached 
        and having a fair market value of                                                               $
                                                                                                         ---------------
 [_]    I hereby request that the Committee cancel the number of Shares covered by my Stock Option      
        Agreement with the Company having a fair market value of                                        $
                                                                                                         ---------------

        Total Exercise Price                                                                            $
                                                                                                         ---------------
<CAPTION> 
ISSUANCE OF CERTIFICATES
 I hereby direct that the stock certificates representing the Shares purchased pursuant to section
  2 above be issued to the following person(s) in the amount specified below:

<S>                                                                  <C>                            <C>        
Name and Address                                                      Social Security No.            No of Shares

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


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

<CAPTION> 
WITHHOLDING ELECTIONS   For Employee Option Recipients with Non-Qualified Stock Options only.  Beneficiaries and Outside Directors 
                        should not complete.

   I understand that I am responsible for the amount of federal, state and local taxes required to be withheld with respect to the
   Shares to be issued to me pursuant to this Notice, but that I may request the Company to retain or sell a sufficient number of
   such Shares to cover the amount to be withheld. I hereby request that any taxes required to be withheld be paid in the following
   manner [check one]:

<S>             <C> 
      [_]       With a certified or bank check that I will deliver to the Committee on the day after the
                Effective Date of my Option exercise.

      [_]       With the proceeds from a sale of Shares that would otherwise be distributed to me.

      [_]       Retain shares that would otherwise be distributed to me.

<CAPTION> 
   I understand that the withholding elections I have made on this form are not binding on the Committee, and that the Committee
   will decide the amount to be withheld and the method of withholding and advise me of its decision prior to the Effective Date. I
   further understand that the Committee may request additional information or assurances regarding the manner and time at which I
   will report the income attributable to the distribution to be made to me.
 
   I further understand that if I have elected to have Shares sold to satisfy tax withholding, I may be asked to pay a minimal
   amount of such taxes in cash in order to avoid the sale of more Shares than are necessary.

<CAPTION> 
COMPLIANCE WITH TAX AND SECURITIES LAWS
<S>     <C>     <C> 
                 I understand that I must rely on, and consult with, my own tax and legal counsel (and not the Company) regarding
 S       H       the application of all laws --particularly tax and securities laws -- to the transactions to be effected pursuant
 I       E       to my Option and this Notice. I understand that I will be responsible for paying any federal, state and local taxes
 G       R       that may become due upon the sale (including a sale pursuant to a "cashless exercise") or other disposition of
 N       E       Shares issued pursuant to this Notice and that I must consult with my own tax advisor regarding how and when such
                 income will be reportable.
 
 
                 ---------------------------------------------------            ------------------------------------
                                              Signature                                          Date
 
                 ---------------------------------------------------------------------------------------------------
                                                                     Address
- ----------------------------------------------------------------------------------------------------------------------------------

<CAPTION> 
- ----------------------------------------------------------------------------------------------------------------------------------
                                                         INTERNAL USE ONLY
<S>                             <C>             <C>                                     <C>  
Received  [check one]:          [_]  By Hand    [_]  By Mail Post Marked
                                                                                        _______________________________
                                                                                                Date of Post Mark

By 
   -----------------------------------------------------                                _______________________________        
                Authorized Signature                                                             Date of Receipt
- ----------------------------------------------------------------------------------------------------------------------------------
</TABLE>

                                      -5-
<PAGE>
 
                      APPENDIX B TO STOCK OPTION AGREEMENT
          NEW HAMPSHIRE THRIFT BANCSHARES, INC. 1998 STOCK OPTION PLAN

                          BENEFICIARY DESIGNATION FORM


<TABLE>
<CAPTION>
- ------------------------------------------------------------------------------------------------------------------------------------
<S>                   <C>   
GENERAL              
INFORMATION           Use this form to designate the Beneficiary(ies) who may exercise Options outstanding to you at the time of 
                      your death. 

NAME OF PERSON
MAKING DESIGNATION                                                              SOCIAL SECURITY NUMBER       -       -
                      ------------------------------------------------                                 -----------------------------

<S>                   <C> 
BENEFICIARY           Complete sections A and B. If no percentage shares are specified, each Beneficiary in the same class
DESIGNATION           (primary or contingent) shall have an equal share.  If any designated Beneficiary predeceases you,
                      the shares of each remaining Beneficiary in the same class (primary or contingent) shall be
                      increased proportionately.

<CAPTION>  
A  PRIMARY BENEFICIARY(IES).  I hereby designate the following person as my primary Beneficiary under the Plan, reserving the
 right to change or revoke this designation at any time prior to my death:
 
<S>                             <C>                                     <C>             <C>                  <C> 
Name                            Address                                  Relationship     Birthdate                 Share

                                ------------------------------------                                                             %
- -----------------------         ------------------------------------    -------------   ---------------       --------------------
                                ------------------------------------                                                             %
- -----------------------         ------------------------------------    -------------   ---------------       --------------------
                                ------------------------------------                                                             %
- -----------------------         ------------------------------------    -------------   ---------------       --------------------
                                                                                                              Total  =  100%

<CAPTION> 
B  CONTINGENT BENEFICIARY(IES).  I hereby designate the following person(s) as my contingent Beneficiary(ies) under the Plan to
 receive benefits only if all of my primary Beneficiaries should predecease me, reserving the right to change or revoke this
 designation at any time prior to my death as to all outstanding Options:

<S>                             <C>                                     <C>             <C>                  <C> 
Name                            Address                                  Relationship     Birthdate                 Share

                                ------------------------------------                                                             %
- -----------------------         ------------------------------------    -------------   ---------------       --------------------
                                ------------------------------------                                                             %
- -----------------------         ------------------------------------    -------------   ---------------       --------------------
                                ------------------------------------                                                             %
- -----------------------         ------------------------------------    -------------   ---------------       --------------------
                                                                                                              Total  =  100%

<CAPTION> 
- ------------------------------------------------------------------------------------------------------------------------------------

<S>     <C>            <C>
S       H              I understand that this Beneficiary Designation shall be effective only if properly completed and
I       E              received by the Corporate Secretary of New Hampshire Thrift Bancshares, Inc. prior to my death, and
G       R              that it is subject to all of the terms and conditions of the Plan.  I also understand that an
N       E              effective Beneficiary designation revokes my prior designation(s) with respect to all outstanding
                       Options.
 
 
 
                       ---------------------------------------------------------------    ---------------------------------
                                                 Your Signature                                         Date
<CAPTION> 
- ------------------------------------------------------------------------------------------------------------------------------------

                                                         INTERNAL USE ONLY
                                                        ------------------
<S>                                                                                                     <C> 
This Beneficiary Designation was received by the Corporate Secretary of New                              Comments
 Hampshire Thrift Bancshares, Inc. on the date indicated.
 
 
 
 
 
 
By
   -------------------------------------------------     --------------------
                Authorized Signature                            Date
- ------------------------------------------------------------------------------------------------------------------------------------
</TABLE> 
                                                                 Date of Receipt

<PAGE>
 
                                October 28, 1998



New Hampshire Thrift Bancshares, Inc.
9 Main Street
Newport, New Hampshire  03773



               Re:  Registration Statement on Form S-8
                    ----------------------------------

Dear Sirs:

          We have acted as counsel for New Hampshire Thrift Bancshares, Inc., a
Delaware corporation (the "Company"), in connection with the filing of a
registration statement on Form S-8 under the Securities Act of 1933, as amended
("Registration Statement") with respect to shares of its common stock, par value
$0.01 per share (the "Shares"), of which 208,855 shares are authorized but
unissued shares which have been reserved for issuance ("Original Issue Shares")
upon the exercise of options granted pursuant to the Company's 1998 Stock Option
Plan (the "Plan"). In rendering the opinion set forth below, we do not express
any opinion concerning law other than the law of the State of Delaware and the
federal law of the United States.

          We have examined originals or copies, certified or otherwise
identified, of such documents, corporate records and other instruments as we
have deemed necessary or advisable for purposes of this opinion.  As to matters
of fact, we have examined and relied upon the Plan described above and, where we
have deemed appropriate, representations or certificates of officers of the
Company or public officials. We have assumed the authenticity of all documents
submitted to us as originals, the genuineness of all signatures, the legal
capacity of natural persons and the conformity to the originals of all documents
submitted to us as copies.

<PAGE>
New Hampshire Thrift Bancshares, Inc.
October 28, 1998
Page 2
 
          Based on the foregoing, we are of the opinion that the Original Issue
Shares that are being registered pursuant to the Registration Statement have
been duly authorized and, when issued and paid for in accordance with the terms
of the Plan, such Original Issue Shares will be validly issued, fully paid and
non-assessable.

          In rendering the opinion set forth above, we have not passed upon and
do not purport to pass upon the application of "doing business" or securities or
"blue-sky" laws of any jurisdiction (except federal securities laws).

          This opinion is given solely for the benefit of the Company and
purchasers of Shares under the Plan, and no other person or entity is entitled
to rely hereon without express written consent.

          We hereby consent to the filing of this opinion as an exhibit to the
Registration Statement and to the references to our Firm's name therein.


                                    Very truly yours,

                                         THACHER PROFFITT & WOOD



                                         by: /s/ Richard A. Schaberg

                                              Richard A. Schaberg

 
 

<PAGE>
 
                                 Exhibit 23.2

              [Letterhead of Shatswell, MacLeod & Company, P.C.]



                   Consent of Independent Public Accountants


     We consent to the incorporation by reference in this Registration 
Statement on Form S-8 of New Hampshire Thrift Bancshares, Inc. of our report,
dated January 26, 1998, included in the December 31, 1997 Annual Report on 
Form 10-KSB.


                                          /s/ Shatswell, MacLeod & Company, P.C.
                                          SHATSWELL, MACLEOD & COMPANY, P.C.


West Peabody, Massachusetts
October 28, 1998


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