This Preferred Security is a Global Certificate within the
meaning of the Declaration hereinafter referred to and is registered in the name
of The Depository Trust Company (the "Depositary") or a nominee of the
Depositary. This Preferred Security is exchangeable for Preferred Securities
registered in the name of a person other than the Depositary or its nominee only
in the limited circumstances described in the Declaration and no transfer of
this Preferred Security (other than a transfer of this Preferred Security as a
whole by the Depositary to a nominee of the Depositary or by a nominee of the
Depositary to the Depositary or another nominee of the Depositary) may be
registered except in limited circumstances.

                  Unless this Preferred 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 Preferred 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.


THIS INSTRUMENT IS NOT A SAVINGS ACCOUNT OR A BANK DEPOSIT, IS NOT AN OBLIGATION
OF OR GUARANTEED BY ANY BANKING OR NONBANKING AFFILIATE OF NATIONSBANK
CORPORATION (EXCEPT TO THE EXTENT THAT IT IS GUARANTEED BY NATIONSBANK
CORPORATION AS DESCRIBED HEREIN) AND IS NOT INSURED BY THE FEDERAL DEPOSIT
INSURANCE CORPORATION OR ANY OTHER GOVERNMENTAL AGENCY.

Certificate Number R-1

                                                       CUSIP NO. 628956 20 3


              Certificate Evidencing 8,000,000 Preferred Securities

                                       of

                               NB CAPITAL TRUST I


            7.84% Trust Originated Preferred SecuritiesSM ("TOPrS"SM)
                 (liquidation amount $25 per Preferred Security)

                  NB CAPITAL TRUST I, a statutory business trust formed under
the laws of the State of Delaware (the "Trust"), hereby
- --------
(SM)     "Trust Originated Preferred Securities" and "TOPrS" are service marks
         of Merrill Lynch & Co., Inc.






certifies that CEDE & CO. (the "Holder") is the registered owner of 8,000,000
preferred securities of the Trust representing undivided beneficial interests in
the assets of the Trust designated the 7.84% Trust Originated Preferred
SecuritiesSM (liquidation amount $25 per Preferred Security) (the "Preferred
Securities"). The Preferred Securities are transferable on the books and records
of the Trust, in person or by a duly authorized attorney, upon surren der of
this certificate duly endorsed and in proper form for transfer. The
designation, rights, privileges, restrictions, prefer ences and other terms and
provisions of the Preferred 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 November 27, 1996, as the same may
be amended from time to time (the "Declaration"), including the designation of
the terms of the Preferred Securities as set forth in Annex I to the
Declaration. Capitalized terms used herein but not defined shall have the
meaning given them in the Declaration. The Holder is entitled to the benefits of
the Preferred Securities Guarantee to the extent provided therein. The
Declaration permits the Sponsor to dissolve the Trust at any time. The Sponsor
will provide a copy of the Declaration, the Preferred Securities Guarantee and
the Indenture to a Holder without charge upon written request to the Trust at
its principal place of business.

                  Upon receipt of this certificate, the Holder is bound by the
Declaration and is entitled to the benefits thereunder.

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

                  IN WITNESS WHEREOF, the Trust has executed this certificate
this 4th day of December, 1996.


                                            NB CAPITAL TRUST I


                                            By:________________________________
                                               Name:  John E. Mack
                                               Title: Regular Trustee


                                        2





                         [REVERSE OF PREFERRED SECURITY]

                  Distributions payable on each Preferred Security will be fixed
at a rate per annum of 7.84% (the "Coupon Rate") of the stated liquidation
amount of $25 per Preferred Security, such rate being the rate of interest
payable on the Notes to be held by the Property Trustee. Distributions in
arrears for more than one quarter will bear interest thereon compounded
quarterly at the Coupon Rate (to the extent permitted by applicable law). The
term "Distributions" as used herein includes such cash distributions and any
such interest payable unless otherwise stated. A Distribution is payable only to
the extent that payments are made in respect of the Notes held by the Property
Trustee and to the extent the Property Trustee has funds available therefor. The
amount of Distributions payable for any period will be computed for any full
quarterly Distribution period on the basis of a 360-day year of twelve 30-day
months, and for any period shorter than a full quarterly Distribution period for
which Distributions are computed, Distributions will be computed on the basis of
the actual number of days elapsed per 30-day month.

                  Except as otherwise described below, distributions on the
Preferred Securities will be cumulative, will accrue from the date of original
issuance and will be payable quarterly in arrears, on March 31, June 30,
September 30 and December 31 of each year, commencing on December 31, 1996, to
the person in whose name this Preferred Security is registered at the close of
business on the regular record date for such installment, which shall be the
close of business on the business day next preceding such payment date. [IF
PURSUANT TO THE TERMS OF THE DECLARATION, THE SECURITIES ARE NO LONGER
REPRESENTED BY A GLOBAL SECURITY -- which shall be the close of business on
March 15, June 15, September 15 or December 15,] The Note Issuer has the right
under the Indenture to defer payments of interest by extending the interest
payment period from time to time on the Notes for a period not exceeding 20
consecutive quarters (each an "Extension Period"), provided that no Extension
Period shall last beyond the date of the maturity of the Notes. As a consequence
of such deferral, Distributions will also be deferred hereunder for the same
period. Despite such deferral, quarterly Distributions will continue to accrue
with interest thereon (to the extent permitted by applicable law) at the Coupon
Rate compounded quarterly during any such Extension Period. Prior to the 
termination of any such Extension Period, the Note Issuer may further extend 
such Extension Period; provided that such Extension Period together with all 
such previous and further extensions thereof may not exceed 20 consecutive 
quarters or extend beyond the maturity of the Notes. Payments of accrued 
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 Note Issuer may commence a new Extension Period, subject to the 
above requirements.

                  THE PREFERRED SECURITIES SHALL BE REDEEMABLE AS PROVIDED
IN THE DECLARATION.

                                        3





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


                                   ASSIGNMENT

FOR VALUE RECEIVED, the undersigned assigns and transfers this Preferred
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 Preferred 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 Preferred 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 partici-
         pation 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 substi-
         tution for, STAMP, all in accordance with the Securities and
         Exchange Act of 1934, as amended.

                                       4