Exhibit 4.5

                          CAPITAL SECURITY CERTIFICATE

                               [FACE OF SECURITY]

            THIS CAPITAL SECURITY IS A GLOBAL CAPITAL SECURITY WITHIN THE
MEANING OF THE DECLARATION HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME
OF THE DEPOSITORY TRUST COMPANY (THE "CLEARING AGENCY") OR A NOMINEE OF THE
CLEARING AGENCY. THIS CAPITAL SECURITY IS EXCHANGEABLE FOR CAPITAL SECURITIES
REGISTERED IN THE NAME OF A PERSON OTHER THAN THE CLEARING AGENCY OR ITS NOMINEE
ONLY IN THE LIMITED CIRCUMSTANCES DESCRIBED IN THE DECLARATION AND NO TRANSFER
OF THIS CAPITAL SECURITY (OTHER THAN A TRANSFER OF THIS CAPITAL SECURITY AS A
WHOLE BY THE CLEARING AGENCY TO A NOMINEE OF THE CLEARING AGENCY OR BY A NOMINEE
OF THE CLEARING AGENCY TO THE CLEARING AGENCY OR ANOTHER NOMINEE OF THE CLEARING
AGENCY) MAY BE REGISTERED EXCEPT IN LIMITED CIRCUMSTANCES.

            UNLESS THIS CAPITAL SECURITY IS PRESENTED BY AN AUTHORIZED
REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY (55 WATER STREET, NEW YORK, NEW
YORK) TO THE TRUST OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE OR
PAYMENT, AND ANY CAPITAL SECURITY ISSUED IS REGISTERED IN THE NAME OF CEDE & CO.
OR SUCH OTHER NAME AS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF THE
DEPOSITORY TRUST COMPANY AND ANY PAYMENT HEREON IS MADE TO CEDE & CO., ANY
TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY A PERSON IS
WRONGFUL SINCE THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.

            THE CAPITAL SECURITIES WILL BE ISSUED AND MAY BE TRANSFERRED ONLY IN
BLOCKS HAVING A LIQUIDATION AMOUNT OF NOT LESS THAN $100,000 (100 CAPITAL
SECURITIES). ANY SUCH TRANSFER OF CAPITAL SECURITIES IN A BLOCK HAVING A
LIQUIDATION AMOUNT OF LESS THAN $100,000 SHALL BE DEEMED TO BE VOID AND OF NO
LEGAL EFFECT WHATSOEVER. ANY SUCH TRANSFEREE SHALL BE DEEMED NOT TO BE THE
HOLDER OF SUCH CAPITAL SECURITIES FOR ANY PURPOSE, INCLUDING BUT NOT LIMITED TO
THE RECEIPT OF DISTRIBUTIONS OF SUCH CAPITAL SECURITIES, AND SUCH TRANSFEREE
SHALL BE DEEMED TO HAVE NO INTEREST WHATSOEVER IN SUCH CAPITAL SECURITIES.

            THE HOLDER OF THIS CAPITAL SECURITY BY ITS ACCEPTANCE HEREOF ALSO
AGREES, REPRESENTS AND WARRANTS THAT EITHER (i) IT IS NOT AN EMPLOYEE BENEFIT
PLAN SUBJECT TO THE EMPLOYEE RETIREMENT INCOME SECURITY ACT OF


1974, AS AMENDED ("ERISA") OR (ii) THE ACQUISITION AND HOLDING OF THIS CAPITAL
SECURITY BY IT IS NOT PROHIBITED BY EITHER SECTION OF 406 OF ERISA OR SECTION
4975 OF THE U.S. INTERNAL REVENUE CODE OF 1986, AS AMENDED, OR EXEMPT FROM ANY
SUCH PROHIBITION.


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Certificate Number                                  Number of Capital Securities
B-1                                                                       60,000

                                                    Amount of Capital Securities
                                                                     $60,000,000

                                                             CUSIP NO. _________

                    Certificate Evidencing Capital Securities

                                       of

                             OnBank Capital Trust I

                        9.25% Series B Capital Securities
                (liquidation amount $1,000 per Capital Security)

            OnBank Capital Trust I, a statutory business trust created under the
laws of the State of Delaware (the "Trust"), hereby certifies that Cede & Co.
(the "Holder") is the registered owner of the aggregate liquidation amount of
Capital Securities of the Trust specified in Schedule A hereto representing
undivided beneficial interests in the assets of the Trust designated the 9.25%
Series B Capital Securities (liquidation amount $1,000 per Capital Security)
(the "Capital Securities"). The Capital Securities are transferable on the books
and records of the Trust, in person or by a duly authorized attorney, upon
surrender of this certificate duly endorsed and in proper form for transfer. The
designation, rights, privileges, restrictions, preferences and other terms and
provisions of the Capital Securities represented hereby are issued and shall in
all respects be subject to the provisions of the Amended and Restated
Declaration of Trust of the Trust dated as of February 4, 1997, as the same may
be amended from time to time (the "Declaration"), including the designation of
the terms of the Capital Securities as set forth in Annex I to the Declaration.
Capitalized terms used but not defined herein shall have the meaning given them
in the Declaration. The Sponsor will provide a copy of the Declaration, the
Capital Securities Guarantee and the Indenture to a Holder without charge upon
written request to the Trust at its principal place of business.


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            Upon receipt of this certificate, the Holder is bound by the
Declaration and is entitled to the benefits thereunder and to the benefits of
the Capital Securities Guarantee to the extent provided therein.

            By acceptance, the Holder agrees to treat, for United States federal
income tax purposes, the Debentures as indebtedness and the Capital Securities
as evidence of indirect beneficial ownership in the Debentures.


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            IN WITNESS WHEREOF, the Trust has executed this certificate this
____ day of __________, ____.


                              ONBANK CAPITAL TRUST I


                              By:
                                 ----------------------------
                                 Name:
                                 Administrative Trustee

                PROPERTY TRUSTEE'S CERTIFICATE OF AUTHENTICATION

            This is one of the Capital Securities referred to in the
within-mentioned Declaration.


Dated: _________________, ____

                              THE BANK OF NEW YORK,
                              as Property Trustee


                              By: 
                                  ----------------------
                                  Authorized Signatory


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                              [REVERSE OF SECURITY]

            Distributions payable on each Capital Security will be fixed at a
rate per annum of 9.25% (the "Coupon Rate") of the liquidation amount of $1,000
per Capital Security, such rate being the rate of interest payable on the
Debentures to be held by the Property Trustee. Distributions in arrears for more
than one semi-annual period will bear interest thereon compounded semi-annually
at the Coupon Rate (to the extent permitted by applicable law). Pursuant to the
Registration Rights Agreement, in certain limited circumstances the Debenture
Issuer will be required to pay Liquidated Damages (as defined in the
Registration Rights Agreement) with respect to the Debentures. The term
"Distributions", as used herein, includes such cash distributions and any such
interest and such Liquidated Damages payable unless otherwise stated. A
Distribution is payable only to the extent that payments are made in respect of
the Debentures held by the Property Trustee and to the extent the Property
Trustee has funds on hand legally available therefor.

            Distributions on the Capital Securities will be cumulative, will
accumulate from the most recent date to which Distributions have been paid or,
if no Distributions have been paid, from February 4, 1997 and will be payable
semi-annually in arrears, on February 1 and August 1 of each year, commencing on
August 1, 1997, to the holders of record on the relevant record dates, except as
otherwise described below. The record dates will be the fifteenth day of the
month prior to the month in which the relevant Distribution falls. Distributions
will be computed on the basis of a 360-day year consisting of twelve 30-day
months and, for any period less than a full calendar month, the number of days
elapsed in such month. As long as no Event of Default has occurred and is
continuing under the Indenture, the Debenture Issuer has the right under the
Indenture to defer payments of interest by extending the interest payment period
at any time and from time to time on the Debentures for a period not exceeding
10 consecutive calendar semi-annual periods, including the first such
semi-annual period during such extension period (each an "Extension Period"),
provided that no Extension Period shall end on a date other than an Interest
Payment Date for the Debentures or extend beyond the Maturity Date of the
Debentures. As a consequence of such deferral, Distributions will also be
deferred. Despite such deferral, semi-annual Distributions will continue to
accumulate with interest thereon (to the extent permitted by applicable law, but
not at a rate exceeding the rate of interest then accruing on the


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Debentures) at the Coupon Rate compounded semi-annually during any such
Extension Period. Prior to the termination of any such Extension Period, the
Debenture Issuer may further defer payments of interest by further extending
such Extension Period; provided that such Extension Period, together with all
such previous and further extensions within such Extension Period, may not
exceed 10 consecutive semi-annual periods, including the first semi-annual
period during such Extension Period, end on a date other than an Interest
Payment Date for the Debentures or extend beyond the Maturity Date of the
Debentures. Payments of accumulated Distributions will be payable to Holders as
they appear on the books and records of the Trust on the first record date after
the end of the Extension Period. Upon the termination of any Extension Period
and the payment of all amounts then due, the Debenture Issuer may commence a new
Extension Period, subject to the above requirements.

            Subject to the prior approval of the Federal Reserve Board if such
approval is then required under applicable law or capital guidelines or policies
of the Federal Reserve Board and to certain other conditions set forth in the
Declaration and the Indenture, the Property Trustee may, at the direction of the
Sponsor, at any time liquidate the Trust and cause the Debentures to be
distributed to the holders of the Securities in liquidation of the Trust or,
simultaneous with any redemption of the Debentures, cause a Like Amount of the
Securities to be redeemed by the Trust.

            The Capital Securities shall be redeemable as provided in the
Declaration.


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

                                   ASSIGNMENT

FOR VALUE RECEIVED, the undersigned assigns and transfers this Capital Security
Certificate to:

________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
        (Insert assignee's social security or tax identification number)

________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
                    (Insert address and zip code of assignee)


and irrevocably appoints
________________________________________________________________________________
________________________________________________________________________________
agent to transfer this Capital Security Certificate on the books of the Trust.
The agent may substitute another to act for him or her.


Date: _______________________


Signature: 
           ------------------
(Sign exactly as your name appears on the other side of this Capital
Security Certificate)


Signature Guarantee*: 
                      -----------------------------------
- --------
*     Signature must be guaranteed by an "eligible guarantor institution" that
      is a bank, stockbroker, savings and loan association or credit union
      meeting the requirements of the Registrar, which requirements include
      membership or participation in the Securities Transfer Agents Medallion
      Program ("STAMP") or such other "signature guarantee program" as may be
      determined by the Registrar in addition to, or in substitution for, STAMP,
      all in accordance with the Securities and Exchange Act of 1934, as
      amended.


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[Include the following if the Capital Security bears a Restricted Capital
Securities Legend --

In connection with any transfer of any of the Capital Securities evidenced by
this certificate, the undersigned confirms that such Capital Securities are
being:

CHECK ONE BOX BELOW

      (1)   |_|   exchanged for the undersigned's own account without transfer;
                  or

      (2)   |_|   transferred pursuant to and in compliance with Rule 144A under
                  the Securities Act of 1933; or

      (3)   |_|   transferred pursuant to and in compliance with Regulation S 
                  under the Securities Act of 1933; or

      (4)   |_|   transferred to an institutional "accredited investor" within
                  the meaning of sub-paragraph (a)(1), (2), (3) or (7) of Rule
                  501 under the Securities Act of 1933 that is acquiring the
                  Capital Securities for its own account, or for the account of
                  such an institutional "accredited investor," for investment
                  purposes and not with a view to, or for offer or sale in 
                  connection with, any distribution in violation of the
                  Securities Act of 1933; or

      (5)   |_|   transferred pursuant to another available exemption from the
                  registration requirements of the Securities Act of 1933; or

      (6)   |_|   transferred pursuant to an effective registration statement.

Unless one of the boxes is checked, the Exchange Agent will refuse to register
any of the Capital Securities evidenced by this certificate in the name of any
person other than the registered Holder thereof; provided, however, that if box
(3), (4) or (5) is checked, the Registrar may require, prior to registering any
such transfer of the Capital Securities such legal opinions, certifications and
other information as the Trust has reasonably requested to confirm that such
transfer is being made pursuant to an exemption from, or in a trans-


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action not subject to, the registration requirements of the Securities Act of
1933, such as the exemption provided by Rule 144 under such Act; provided,
further, that (i) if box 2 is checked, the transferee must also certify that it
is a qualified institutional buyer as defined in Rule 144A or (ii) if box (4) is
checked, the transferee must also provide to the Registrar a Transferee Letter
of Representation in the form attached to the Offering Memorandum of the Trust
dated January 30, 1997; provided, further, that after the date that a
Registration Statement has been filed and so long as such Registration Statement
continues to be effective, the Registrar may only permit transfers for which box
(5) has been checked.


                                    -----------------------------------
                                                 Signature


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