Unless this  certificate is presented by an authorized  representative
of The Depository  Trust Company,  a New York corporation  ("DTC"),  to the
issuer or its agent for registration of transfer,  exchange or payment, and
any  certificate  issued is registered in the name of Cede & Co. or in such
other name as is requested by an authorized  representative of DTC (and any
payment is made to Cede & Co. or to such other entity as is requested by an
authorized representative of DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF
FOR VALUE OR  OTHERWISE  BY OR TO ANY PERSON IS  WRONGFUL  inasmuch  as the
registered owner hereof, Cede & Co., has an interest herein.

                INTERNATIONAL BUSINESS MACHINES CORPORATION

                           7% Debenture due 2045

                                                           CUSIP 459200 AN1

No.: R 1                                                       $

     INTERNATIONAL  BUSINESS  MACHINES  CORPORATION,   a  corporation  duly
organized  and  existing  under the laws of the  State of New York  (herein
called the "Company",  which term includes any successor  corporation under
the  Indenture  referred to on the  reverse  hereof),  for value  received,
hereby promises to pay to CEDE & CO., or registered assigns,  the principal
sum of 150,000,000  Dollars,  at the office or agency of the Company in the
Borough of Manhattan,  The City and State of New York, on October 30, 2045,
in such coin or currency of the United  States of America as at the time of
payment shall be legal tender for the payment of public and private  debts,
and to pay interest, semi-annually on April 30 and October 30 of each year,
on said  principal sum at said office or agency,  in like coin or currency,
at the rate of 7% per annum,  from the April 30 and the  October 30, as the
case may be, next  preceding the date of this  Debenture to which  interest
has been paid,  unless the date hereof is a date to which interest has been
paid, in which case from the date of this Debenture,  or unless no interest
has  been  paid on the  Debentures  due  2045 (as  defined  on the  reverse
hereof),  in which  case from  October  30,  1995,  until  payment  of said
principal  sum has been  made or duly  provided  for.  Notwithstanding  the
foregoing,  if the date hereof is after April 15 or October 15, as the case
may be, and before the  following  April 30 or October 30,  this  Debenture
shall bear  interest from such April 30 or October 30;  provided,  however,
that if the Company  shall  default in the payment of interest  due on such
April 30 or October 30, then this  Debenture  shall bear  interest from the
next preceding  April 30 or October 30 to which interest has been paid, or,
if no interest has been paid on the Debentures  due 2045,  from October 30,
1995.  The interest so payable on any April 30 or October 30 will,  subject
to certain exceptions  provided in the Indenture referred to on the reverse
hereof, be paid to the person in whose name this Debenture is registered at
the close of  business  on such April 15 or October 15, as the case may be,
next  preceding  such April 30 or October  30,  unless  the  Company  shall
default in the payment of interest due on such  interest  payment  date, in
which case such defaulted  interest,  at the option of the Company,  may be
paid to the person in whose name this  Debenture is registered at the close
of  business on a special  record  date for the  payment of such  defaulted
interest  established by notice to the registered holders of Debentures not
less than ten days  preceding such special record date or maybe paid in any
other  lawful  manner  not  inconsistent   with  the  requirements  of  any
securities exchange on which the Debentures due 2045 may be listed. Payment
of interest  may, at the option of the Company,  be made by check mailed to
the registered address of the person entitled thereto.

     Reference  is made to the further  provisions  of this  Debenture  set
forth on the reverse hereof. Such further provisions shall for all purposes
have the same effect as though fully set forth at this place.

     This Debenture shall not be valid or become obligatory for any purpose
until the  certificate of  authentication  hereon shall have been signed by
the Trustee under the Indenture referred to on the reverse hereof.

     IN WITNESS WHEREOF,  the Company has caused this instrument to be duly
executed under its corporate seal.

Dated:


TRUSTEE'S CERTIFICATE
OF AUTHENTICATION

     This is one of the Securities
of the Series  designated  herein issued
under the within-mentioned Indenture.


THE CHASE MANHATTAN BANK (NATIONAL ASSOCIATION), as Trustee


    by____________________________________________________________________
               Authorized Signatory



                                                    [SEAL]


INTERNATIONAL BUSINESS MACHINES CORPORATION



     by____________________________________________________________________



     by____________________________________________________________________






     This  Debenture  is  one  of a  duly  authorized  issue  of  unsecured
debentures,  notes  or  other  evidences  of  indebtedness  of the  Company
(hereinafter called the "Securities"), of the series hereinafter specified,
all issued or to be issued under an  indenture  dated as of October 1, 1993
(hereinafter  called the  "Indenture"),  duly executed and delivered by the
Company to The Chase  Manhattan  Bank  (National  Association),  a New York
banking  corporation,  as trustee  (hereinafter  called the "Trustee"),  to
which Indenture and all indentures supplemental thereto reference is hereby
made for a description  of the respective  rights and duties  thereunder of
the Trustee, the Company and the holders of the Securities.  The Securities
may be issued in one or more series,  which different  series may be issued
in various aggregate principal amounts,  may mature at different times, may
bear interest at different rates, may have different  conversion prices (if
any), may be subject to different redemption provisions,  may be subject to
different sinking, purchase or analogous funds, may be subject to different
covenants and Events of Default and may otherwise  vary as in the Indenture
provided. This Debenture is one of a series designated as the 7% Debentures
due 2045 of the  Company  (hereinafter  called the  "Debentures  due 2045")
issued  under the  Indenture,  limited  in  aggregate  principal  amount to
$150,000,000.

     In case an Event of Default with respect to the  Debentures  due 2045,
as defined in the  Indenture,  shall have occurred and be  continuing,  the
principal  hereof together with interest  accrued  thereon,  if any, may be
declared,  and upon such declaration shall become, due and payable,  in the
manner,  with the effect  and  subject to the  conditions  provided  in the
Indenture.

     The  Indenture  contains  provisions  permitting  the  Company and the
Trustee,  with the  consent of the  holders of not less than a majority  in
aggregate principal amount of the Securities at the time outstanding of all
series  to be  affected  (acting  as one  class)  to  execute  supplemental
indentures   adding  any  provisions  to  or  changing  in  any  manner  or
eliminating  any of the provisions of the Indenture or of any  supplemental
indenture  or  modifying  in any manner  the  rights of the  holders of the
Securities of such series to be affected;  provided,  however, that no such
supplemental  indenture  shall,  among other  things,  (i) change the fixed
maturity  of the  principal  of,  or any  installment  of  principal  of or
interest on, any Security;  (ii) reduce the principal amount thereof or the
rate of  interest  thereon  or any  premium  payable  upon  the  redemption
thereof;  (iii) impair the right to institute  suit for the  enforcement of
any such payment on or after the fixed maturity thereof (or, in the case of
redemption, on or after the redemption date); (iv) reduce the percentage in
principal amount of the outstanding  Securities of any series,  the consent
of whose holders is required for any such  supplemental  indenture,  or the
consent of whose  holders is required  for any waiver (of  compliance  with
certain  provisions of the  Indenture or certain  defaults  thereunder  and
their  consequences)  provided  for  in  the  Indenture;   (v)  change  any
obligation  of the Company,  with respect to  outstanding  Securities  of a
series,  to maintain an office or agency in the places and for the purposes
specified  in the  Indenture  for such  series;  or (vi)  modify any of the
foregoing  provisions or the provisions for the waiver of certain covenants
and defaults, except to increase any applicable percentage of the aggregate
principal  amount of  outstanding  Securities the consent of the holders of
which is required or to provide with respect to any  particular  series the
right to condition the  effectiveness of any  supplemental  indenture as to
that series on the consent of the holders of a specified  percentage of the
aggregate  principal amount of outstanding  Securities of such series or to
provide that certain other  provisions of the Indenture  cannot be modified
or waived  without the consent of the holder of each  outstanding  Security
affected thereby.  It is also provided in the Indenture that the holders of
a majority in aggregate  principal  amount of the Securities of a series at
the time  outstanding may on behalf of the holders of all the Securities of
such series waive any past default under the Indenture with respect to such
series  and its  consequences,  except  a  default  in the  payment  of the
principal of, premium, if any, or interest, if any, on any Security of such
series or in respect of a covenant or  provision  which  cannot be modified
without  the  consent of the  Holder of each  outstanding  Security  of the
series affected. Any such consent or waiver by the holder of this Debenture
shall be  conclusive  and  binding  upon such  holder  and upon all  future
holders and owners of this  Debenture and any Debentures due 2045 which may
be issued in exchange or substitution  herefor,  irrespective of whether or
not any  notation  thereof  is  made  upon  this  Debenture  or such  other
Debentures due 2045.

     No  reference  herein  to the  Indenture  and  no  provision  of  this
Debenture or of the Indenture  shall alter or impair the  obligation of the
Company,  which is absolute and unconditional,  to pay the principal of, if
any, and interest on this Debenture at the place, at the respective  times,
at the rate and in the coin or currency herein prescribed.




     The Indenture  permits the Company to Discharge its  obligations  with
respect  to  the  Debentures  due  2045  on  the  91st  day  following  the
satisfaction  of the conditions  set forth in the Indenture,  which include
the deposit with the Trustee of money or U.S.  Government  Obligations or a
combination  thereof  sufficient to pay and discharge  each  installment of
principal of (including premium,  if any, on) and interest,  if any, on the
outstanding Debentures due 2045.

     If the Company shall, in accordance with Section 901 of the Indenture,
consolidate with or merge into any other  corporation or convey or transfer
its properties and assets  substantially as an entirety to any Person,  the
successor shall succeed to, and be substituted for, the Person named as the
"Company" on the face of this Debenture,  all on the terms set forth in the
Indenture.

     The  Debentures  due 2045 are  issuable  in  registered  form  without
coupons in denominations of $1,000 and any integral  multiple of $1,000. In
the manner and subject to the  limitations  provided in the Indenture,  but
without  the  payment of any  service  charge,  Debentures  due 2045 may be
exchanged for an equal aggregate principal amount of Debentures due 2045 of
other  authorized  denominations  at the  office or  agency of the  Company
maintained for such purpose in the Borough of Manhattan, The City and State
of New York.

     The  Debentures due 2045 may be redeemed as a whole or in part, at the
option of the Company at any time, upon mailing a notice of such redemption
not  less  than 30 nor  more  than 60 days  prior  to the  date  fixed  for
redemption  to the  holders  of the  Debentures  due  2045  at  their  last
registered  addresses,  all as provided in the  Indenture,  at a redemption
price  equal to the  greater  of (i) 100% of the  principal  amount of such
Debentures due 2045 and (ii) the sum of the present values of the remaining
scheduled  payments of principal  and interest  thereon  discounted  to the
redemption  date on a semiannual  basis (assuming a 360-day year consisting
of twelve 30-day months) at the Treasury Rate plus 12.5 basis points,  plus
in each case accrued interest thereon on the date of redemption.

     "Treasury Rate" means,  with respect to any redemption  date, the rate
per annum  equal to the  semiannual  equivalent  yield to  maturity  of the
Comparable  Treasury  Issue,  assuming a price for the Comparable  Treasury
Issue  (expressed  as a percentage  of its  principal  amount) equal to the
Comparable Treasury Price for such redemption date.

     "Comparable  Treasury Issue" means the United States Treasury security
selected  by  an  Independent   Investment  Banker  as  having  a  maturity
comparable to the remaining  term of the Debentures due 2045 to be redeemed
that would be utilized,  at the time of selection  and in  accordance  with
customary  financial  practice,  in pricing  new issues of  corporate  debt
securities of comparable maturity to the remaining term of such Debentures.
"Independent Investment Banker" means one of the Reference Treasury Dealers
appointed by the Trustee after consultation with the Company.

     "Comparable Treasury Price" means with respect to any redemption date,
(i) the  average of the bid and asked  prices for the  Comparable  Treasury
Issue  (expressed in each case as a percentage of its principal  amount) on
the third business day preceding such redemption  date, as set forth in the
daily  statistical  release (or any  successor  release)  published  by the
Federal  Reserve  Bank of New  York and  designated  "Composite  3:30  p.m.
Quotations for U.S. Government  Securities" or (ii) if such release (or any
successor release) is not published or does not contain such prices on such
business day, (A) the average of the Reference  Treasury Dealer  Quotations
for such  redemption  date,  after  excluding  the  highest and lowest such
Reference Treasury Dealer  Quotations,  or (B) if the Trustee obtains fewer
than four such Reference Treasury Deal Quotations,  the average of all such
Quotations.  "Reference  Treasury Dealer Quotations" means, with respect to
each Reference  Treasury  Dealer and any redemption  date, the average,  as
determined by the Trustee,  of the bid and asked prices for the  Comparable
Treasury  Issue  (expected  in each case as a percentage  of its  principal
amount) quoted in writing to the Trustee by such Reference  Treasury Dealer
at 5:00 p.m. on the third business day preceding such redemption date.

     "Reference  Treasury  Dealer"  means  each of Merrill  Lynch,  Pierce,
Fenner & Smith Incorporated, CS First Boston Corporation,  Goldman, Sachs &
Co.,  J.P.  Morgan  Securities  Inc.,  Morgan  Stanley & Co.  Incorporated,
Salomon Brothers Inc and their respective  successors;  provided,  however,
that if any of the foregoing




shall cease to be a primary U.S. Government securities dealer in New
York City (a  "Primary  Treasury  Dealer"),  the Company  shall  substitute
therefor another Primary Treasury Dealer.

     Upon due  presentation  for registration of transfer of this Debenture
at the office or agency of the Company for such registration in the Borough
of Manhattan, The City and State of New York, a new Debenture or Debentures
of authorized denominations for an equal aggregate principal amount will be
issued to the transferee in exchange  herefor,  subject to the  limitations
provided  in the  Indenture,  without  charge  except  for any tax or other
governmental charge imposed in connection therewith.

     Prior  to  due  presentment  for  registration  of  transfer  of  this
Debenture,  the  Company,  the  Trustee and any agent of the Company or the
Trustee may deem and treat the  registered  holder  hereof as the  absolute
owner of this Debenture  (whether or not this  Debenture  shall be overdue)
for the purpose of receiving payment of the principal of, premium,  if any,
and  interest  on this  Debenture,  as herein  provided,  and for all other
purposes,  and  neither  the  Company  nor the Trustee nor any agent of the
Company or the Trustee shall be affected by any notice of the contrary. All
payments made to or upon the order of such registered  holder shall, to the
extent of the sum or sums paid, effectually satisfy and discharge liability
for moneys payable on this Debenture.

     No recourse for the payment of the principal of,  premium,  if any, or
interest on this  Debenture,  or for any claim based hereon or otherwise in
respect hereof,  and no recourse under or upon any obligation,  covenant or
agreement  of the Company in the  Indenture or any  indenture  supplemental
thereto or in any Debenture, or because of the creation of any indebtedness
represented  thereby,  shall be had against any incorporator,  stockholder,
officer or director, as such, past, present or future, of the Company or of
any successor  corporation,  either  directly or through the Company or any
successor  corporation,  whether by virtue of any constitution,  statute or
rule  of  law  or by  the  enforcement  of any  assessment  or  penalty  or
otherwise,  all such liability being, by the acceptance  hereof and as part
of the consideration for the issue hereof, expressly waived and released.

     Unless  otherwise  defined in this  Debenture,  all terms used in this
Debenture  which are  defined  in the  Indenture  shall  have the  meanings
assigned to them in the Indenture.

     THIS DEBENTURE  SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE  WITH
THE LAWS OF THE STATE OF NEW YORK.