CAPITAL ONE MASTER TRUST
8-A12G, 1998-11-24
ASSET-BACKED SECURITIES
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<PAGE>
 
                      SECURITIES AND EXCHANGE COMMISSION

                            Washington, D.C.  20549


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

                                   FORM 8-A

               FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES
                   PURSUANT TO SECTION 12(b) OR 12(g) OF THE
                        SECURITIES EXCHANGE ACT OF 1934

                               Capital One Bank
                 (Originator of the Capital One Master Trust)
                               on behalf of the
                           Capital One Master Trust
                   (Issuer of the Asset Backed Certificates)
            ------------------------------------------------------
            (Exact name of registrant as specified in its charter)

                Virginia                               54-1719855
- ----------------------------------------         ----------------------  
(State of incorporation or organization)              (IRS Employer
                                                   Identification No.)


         11013 West Broad Street 
           Glen Allen, Virginia                           23060
- ----------------------------------------         ----------------------  
(Address of principal executive offices)                (Zip Code)

If this form relates to the registration of a class of securities pursuant to
Section 12(b) of the Exchange Act and is effective pursuant to General
Instruction A.(c) please check the following box. [_]

If this form relates to the registration of a class of securities pursuant to
Section 12(g) of the Exchange Act and is effective pursuant to General
Instruction A.(d) please check the following box. [X]

Securities Act registration statement file number to which this form relates:

                                   33-99276

Securities to be registered pursuant to Section 12(b) of the Act:

                                     None

Securities to be registered pursuant to Section 12(g) of the Act:

                           Capital One Master Trust
      $631,875,000 Class A 5.43% Asset Backed Certificates, Series 1998-4
      -------------------------------------------------------------------
                               (Title of Class)
<PAGE>
 
INFORMATION REQUIRED IN REGISTRATION STATEMENT


Item 1.  Description of Registrant's Securities to be Registered.
         ------------------------------------------------------- 

         The description of the Class A 5.43% Asset Backed Certificates, Series
         1998-4 appearing under the captions entitled:  "Summary of Series";
         "Introduction"; "Risk Factors"; "Maturity Considerations"; "The
         Receivables"; and "Series Provisions" in the Prospectus Supplement
         dated November 9, 1998 and "Prospectus Summary"; "Risk Factors";
         "Description of the Certificates"; "Certain Legal Aspects of the
         Receivables"; "Federal Income Tax Consequences"; and "ERISA
         Considerations" in the Prospectus, dated November 9, 1998.  (The
         Prospectus Supplement and the Prospectus are incorporated herein by
         reference as Exhibit 4.)



 
Item 2.  Exhibits.
         -------- 

         Exhibit 1--  Form of specimens of certificates representing Class A
                        5.43% Asset Backed Certificates, Series 1998-4.

         Exhibit 2--  Pooling and Servicing Agreement (incorporated by reference
                        to the Registrant's Current Report on Form 8-K filed
                        with the Securities and Exchange Commission on February
                        1, 1994).

         Exhibit 3--  Series 1998-4 Supplement dated November 17, 1998
                        (incorporated by reference to the Registrant's Current
                        Report on Form 8-K filed with the Securities and
                        Exchange Commission on November 24, 1998).

         Exhibit 4--  Prospectus Supplement and Prospectus dated November 9,
                        1998 (incorporated by reference to Prospectus Supplement
                        filed with the Securities and Exchange Commission on
                        November 9, 1998, pursuant to Rule 424(b)(5)).


                                       2
<PAGE>
 
                                   SIGNATURE



          Pursuant to the requirements of Section 12 of the Securities Exchange
Act of 1934, as amended, Capital One Bank on behalf of the Capital One Master
Trust has duly caused this Form 8-A to be signed on its behalf by the
undersigned, thereto duly authorized.

                                    CAPITAL ONE MASTER TRUST
                                    By: CAPITAL ONE BANK



Date:  November 17, 1998            By: /s/ Charles Kim
                                        -----------------------------
                                    Name: Charles Kim
                                    Title: Director of Securitization


                                       3
<PAGE>
 
INDEX TO EXHIBITS
- -----------------

Exhibit 1--  Form of specimens of certificates representing Class A 5.43 % Asset
                      Backed Certificates, Series 1998-4.

Exhibit 2--  Pooling and Servicing Agreement (incorporated by reference to the
                      Registrant's Current Report on Form 8-K filed with the
                      Securities and Exchange Commission on February 1, 1994).

Exhibit 3--  Series 1998-4 Supplement dated November 17, 1998 (incorporated by
                      reference to the Registrant's Current Report on Form 8-K
                      filed with the Securities and Exchange Commission on
                      November 9, 1998).

Exhibit 4--  Prospectus Supplement and Prospectus dated November 9, 1998
                      (incorporated by reference to Prospectus Supplement filed
                      with the Securities and Exchange Commission on November 9,
                      1998, pursuant to Rule 424(b)(5)).


                                       4

<PAGE>
 
                                                                       EXHIBIT 1

REGISTERED                                                          $200,000,000

NO. R-A-1

                                                           CUSIP No. 14040K AM 0

                  Unless this Class A 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.

                            CAPITAL ONE MASTER TRUST

                                  Series 1998-4

                     CLASS A 5.43% ASSET BACKED CERTIFICATE

                      Class A Expected Final Payment Date:
                       The November 2003 Distribution Date

                  Each $1,000 minimum denomination represents a
                          1/631,875 undivided interest
                            in certain assets of the

                            CAPITAL ONE MASTER TRUST

Evidencing an undivided interest in a trust, the corpus of which consists
primarily of receivables generated from time to time in the ordinary course of
business in a portfolio of consumer revolving credit card accounts by

                                CAPITAL ONE BANK

and, in certain circumstances, certain Additional Sellers (as defined in the
Pooling and Servicing Agreement referred to below).

             (Not an interest in or obligation of Capital One Bank,
                 any Additional Seller or any affiliate thereof)

                  This certifies that CEDE & CO. (the "Class A
Certificateholder") is the registered owner of a fractional undivided interest
in certain assets of a trust (the "Trust") created pursuant to the Pooling and
Servicing Agreement dated as of September 30, 1993 (as amended and supplemented,
the "Agreement"), as supplemented by the Series 1998-4 Supplement dated as of
<PAGE>
 
November 17, 1998 (as amended and supplemented, the "Series Supplement"), among
Capital One Bank, as Seller and Servicer, and The Bank of New York, a New York
banking corporation, as trustee (the "Trustee"). The corpus of the Trust
consists of (i) a portfolio of all receivables (the "Receivables") existing in
the consumer revolving credit card accounts and other consumer revolving credit
accounts identified under the Agreement from time to time (the "Accounts"), 
(ii) all Receivables generated under the Accounts from time to time thereafter,
(iii) funds collected or to be collected from accountholders in respect of the
Receivables, (iv) all funds which are from time to time on deposit in the
Collection Account and in the Series Accounts, (v) an interest in any Funds
Collateral relating to secured accounts, (vi) the benefits of any Series
Enhancement and (vii) all other assets and interests constituting the Trust. The
Holder of this Class A Certificate is entitled to the benefit of funds on
deposit in a Cash Collateral Account and any Series Enhancement to the extent
provided in the Series Supplement. Although a summary of certain provisions of
the Agreement and the Series Supplement is set forth below and on the Summary of
Terms and Conditions attached hereto and made a part hereof, this Class A
Certificate does not purport to summarize the Agreement and the Series
Supplement and reference is made to the Agreement and the Series Supplement for
information with respect to the interests, rights, benefits, obligations,
proceeds and duties evidenced hereby and the rights, duties and obligations of
the Trustee. A copy of the Agreement and the Series Supplement (without
schedules) may be requested from the Trustee by writing to the Trustee at the
Corporate Trust Office. To the extent not defined herein, the capitalized terms
used herein have the meanings ascribed to them in the Agreement or the Series
Supplement, as applicable.

                  This Class A Certificate is issued under and is subject to the
terms, provisions and conditions of the Agreement and the Series Supplement, to
which Agreement and Series Supplement, each as amended and supplemented from
time to time, the Class A Certificateholder by virtue of the acceptance hereof
assents and is bound.

                  It is the intent of the Seller and the Investor
Certificateholders that, for federal, state and local income and franchise tax
purposes only, the Investor Certificates will qualify as indebtedness of the
Seller secured by the Receivables. The Class A Certificateholder, by the
acceptance of this Class A Certificate, agrees to treat this Class A Certificate
for federal, state and local income and franchise tax purposes as indebtedness
of the Seller.

                  In general, payments of principal with respect to the Class A
Certificates are limited to the Class A Invested Amount, which may be less than
the unpaid principal balance of the Class A Certificates. The Class A Expected
Final Payment Date is the November 2003 Distribution Date, but principal with
respect to the Class A Certificates may be paid earlier or later under certain
circumstances described in the Agreement and the Series Supplement. If for

                                       2
<PAGE>
 
one or more months during the Class A Accumulation Period there are not
sufficient funds to pay the Controlled Deposit Amount, then to the extent that
excess funds are not available on subsequent Distribution Dates with respect to
the Class A Accumulation Period to make up for such shortfalls, the final
payment of principal of the Class A Certificates will occur later than the Class
A Expected Final Payment Date.

          Unless the certificate of authentication hereon has been executed by
or on behalf of the Trustee, by manual signature, this Class A Certificate shall
not be entitled to any benefit under the Agreement or the Series Supplement or
be valid for any purpose.

          IN WITNESS WHEREOF, the Seller has caused this Class A Certificate to
be duly executed.

  
                                    CAPITAL ONE BANK


                                    By:/s/ Charles Kim 
                                       ----------------------------------
                                       Name:   Charles Kim
                                       Title:  Director of Securitization


Dated: November 17, 1998
<PAGE>
 
                    TRUSTEE'S CERTIFICATE OF AUTHENTICATION

          This is one of the Class A Certificates described in the within-
mentioned Agreement and Series Supplement.


                              THE BANK OF NEW YORK,
                               as Trustee


                              By: /s/ Cheryl Laser
                                 --------------------------
                                 Authorized Officer


                              or


                              By:
                                 --------------------------
                                 as Authenticating Agent
                                 for the Trustee


                              By:
                                 --------------------------
                                 Authorized Officer
<PAGE>
 
                           CAPITAL ONE MASTER TRUST

                                 SERIES 1998-4

                    CLASS A 5.43% ASSET BACKED CERTIFICATE

                        Summary of Terms and Conditions


          The Receivables consist of Principal Receivables which arise generally
from the purchase of goods and services and amounts advanced to accountholders
as cash advances and Finance Charge Receivables.  This Class A Certificate is
one of a Series of Investor Certificates entitled "Capital One Master Trust,
Series 1998-4."  The Series1998-4 Certificates are being issued in two Classes,
the first of which is known as the "Class A 5.43% Asset Backed Certificates,
Series 1998-4" (the "Class A Certificates") and the second Class is known as the
"Class B Floating Rate Asset Backed Certificates, Series 1998-4" (the  "Class B
Certificates").  In addition, as part of Series 1998-4, the Trust is creating a
third Class of uncertificated interests in the Trust which uncertificated
interests, except as expressly provided in the Series Supplement, are deemed to
be "Investor Certificates" and are known as the "Class C Floating Rate Asset
Backed Interests, Series 1998-4" (the "Class C Interests").  This Class A
Certificate represents a fractional undivided interest in certain assets of the
Trust.  The Trust Assets are allocated in part to the certificateholders of all
outstanding Series (the "Certificateholders' Interest") with the remainder
allocated to the Seller's Interest.  The aggregate interest represented by the
Class A  Certificates at any time in the Principal Receivables in the Trust
shall not exceed an amount equal to the Class A Invested Amount at such time.
The Class A Initial Invested Amount is $631,875,000.  The Class A Invested
Amount on any date will be an amount equal to (a) the Class A Initial Invested
Amount, minus (b) the aggregate amount of principal payments made to the Class A
Certificateholders on or prior to such date, minus (c) the excess, if any, of
the aggregate amount of Class A Investor Charge-Offs for all prior Distribution
Dates over the aggregate amount of Class A Investor Charge-Offs reimbursed
pursuant to Section 4.06(a) of the Series Supplement prior to such date.  Also,
a Seller's Certificate has been issued to Capital One Bank pursuant to the
Agreement which represents the Seller's Interest on the date hereof.

          Subject to the terms and conditions of the Agreement, the Seller may
from time to time direct the Trustee, on behalf of the Trust, to issue one or
more new Series of Investor Certificates, which will represent fractional
undivided interests in certain of the Trust Assets.

          On each Payment Date, the Paying Agent shall distribute to each Class
A Certificateholder of record on the last day of the preceding calendar month
(each a "Record Date") such Class A Certificateholder's pro rata share of such
amounts (including amounts on deposit in the Collection Account and the
Principal Funding Account) as are payable to the Class A Certificateholders
pursuant to the Agreement and the Series Supplement.  Distributions with respect
to this Class A Certificate will be made by the Paying Agent by check mailed to
the address of the Class A Certificateholder of record appearing in the
Certificate Register without the presentation or surrender of this Class A
Certificate or the making of any notation thereon 


                                       5
<PAGE>
 
(except for the final distribution in respect of this Class A Certificate),
except that with respect to Class A Certificates registered in the name of Cede
& Co., the nominee for The Depository Trust Company, distributions will be made
in the form of immediately available funds. Final payment of this Class A
Certificate will be made only upon presentation and surrender of this Class A
Certificate at the office or agency specified in the notice of final
distribution delivered by the Trustee to the Class A Certificateholders in
accordance with the Agreement and the Series Supplement.

          On any day occurring on or after the day on which the Invested Amount
is reduced to 5% or less of the Initial Invested Amount, the Seller has the
option to repurchase the Certificateholders' Interest in the Trust.  The
repurchase price will be equal to (a) if such day is a Distribution Date, the
Reassignment Amount for such Distribution Date or (b) if such day is not a
Distribution Date, the Reassignment Amount for the Distribution Date following
such day.  Following the deposit of the Reassignment Amount in the Collection
Account, Class A Certificateholders, the Class B Certificateholders and the
Class C Interest Holders will not have any interest in the Receivables and the
Class A Certificates will represent only the right to receive such Reassignment
Amount.

          This Class A Certificate does not represent an obligation of, or an
interest in, the Seller, the Servicer or any affiliate of any of them and is not
insured or guaranteed by the Federal Deposit Insurance Corporation or any other
governmental agency or instrumentality.  This Class A Certificate is limited in
right of payment to certain Collections with respect to the Receivables (and
certain other amounts), all as more specifically set forth hereinabove and in
the Agreement and the Series Supplement.

          The Agreement or any Supplement may, subject to certain conditions, be
amended by the Seller, the Servicer and the Trustee without Certificateholder
consent. The Trustee may, but shall not be obligated to, enter into any such
amendment which affects the Trustee's rights, duties or immunities under the
Agreement or otherwise.

          The Agreement or any Supplement may also be amended from time to time
by the Servicer, the Seller and the Trustee, with the consent of the Holders of
Investor Certificates evidencing not less than 66-2/3% of the aggregate unpaid
principal amount of the Investor Certificates of all adversely affected Series,
for the purpose of adding any provisions to or changing in any manner or
eliminating any of the provisions of the Agreement or any Supplement or of
modifying in any manner the rights of the Investor Certificateholders; provided,
                                                                       -------- 
however, that no such amendment shall (i) reduce in any manner the amount of or
- -------                                                                        
delay the timing of any distributions to be made to Investor Certificateholders
or deposits of amounts to be so distributed or the amount available under any
Series Enhancement without the consent of each affected Investor
Certificateholder, (ii) change the definition of or the manner of calculating
the interest of any Investor Certificateholder without the consent of each
affected Investor Certificateholder, (iii) reduce the aforesaid percentage
required to consent to any such amendment without the consent of each Investor
Certificateholder or (iv) adversely affect the rating of any Series or Class by
each Rating Agency without the consent of the Holders of Investor Certificates
of such Series or Class evidencing not less than 66-2/3% of the aggregate 


                                       6
<PAGE>
 
unpaid principal amount of the Investor Certificates of such Series or Class.
The Trustee may, but shall not be obligated to, enter into any such amendment
which affects the Trustee's rights, duties or immunities under the Agreement or
otherwise.

          The Class A Certificates are issuable only in minimum denominations of
$1,000 and integral multiples of $1,000.  The transfer of this Class A
Certificate shall be registered in the Certificate Register upon surrender of
this Class A Certificate for registration of transfer at any office or agency
maintained by the Transfer Agent and Registrar accompanied by a written
instrument of transfer, in a form satisfactory to the Trustee or the Transfer
Agent and Registrar, duly executed by the Class A Certificateholder or such
Class A Certificateholder's attorney, and duly authorized in writing with such
signature guaranteed, and thereupon one or more new Class A Certificates of
authorized denominations and for the same aggregate fractional undivided
interest will be issued to the designated transferee or transferees.

          As provided in the Agreement and subject to certain limitations
therein set forth, Class A Certificates are exchangeable for new Class A
Certificates evidencing like aggregate fractional undivided interests as
requested by the Class A Certificateholder surrendering such Class A
Certificates.  No service charge may be imposed for any such exchange but the
Servicer or Transfer Agent and Registrar may require payment of a sum sufficient
to cover any tax or other governmental charge that may be imposed in connection
therewith.

          The Servicer, the Trustee, the Paying Agent and the Transfer Agent and
Registrar and any agent of any of them, may treat the person in whose name this
Class A Certificate is registered as the owner hereof for all purposes, and
neither the Servicer nor the Trustee, the Paying Agent, the Transfer Agent and
Registrar, nor any agent of any of them, shall be affected by notice to the
contrary except in certain circumstances described in the Agreement.

          THIS CLASS A CERTIFICATE SHALL BE CONSTRUED IN ACCORDANCE WITH THE
LAWS OF THE STATE OF NEW YORK, WITHOUT REFERENCE TO ITS CONFLICT OF LAW
PROVISIONS, AND THE OBLIGATIONS, RIGHTS AND REMEDIES OF THE PARTIES HEREUNDER
SHALL BE DETERMINED IN ACCORDANCE WITH SUCH LAWS.


                                       7
<PAGE>
 
                                  ASSIGNMENT


Social Security or other identifying number of assignee _____________________

          FOR VALUE RECEIVED, the undersigned hereby sells, assigns and
transfers unto ______________________________________________________________
                        (name and address of assignee)

the within certificate and all rights thereunder, and hereby irrevocably
constitutes and appoints ______________________, attorney, to transfer said
certificate on the books kept for registration thereof, with full power of
substitution in the premises.



Dated: _____________________*


Signature Guaranteed:


____________________________











- ----------------------------
*NOTE:  The signature to this assignment must correspond with the name of the
registered owner as it appears on the face of the within Certificate in every
particular, without alteration, enlargement or any change whatsoever.
<PAGE>
 
REGISTERED                                                          $200,000,000

NO. R-A-2

                                                           CUSIP No. 14040K AM 0

                  Unless this Class A 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.

                            CAPITAL ONE MASTER TRUST

                                  Series 1998-4

                     CLASS A 5.43% ASSET BACKED CERTIFICATE

                      Class A Expected Final Payment Date:
                       The November 2003 Distribution Date

                  Each $1,000 minimum denomination represents a
                          1/631,875 undivided interest
                            in certain assets of the

                            CAPITAL ONE MASTER TRUST

Evidencing an undivided interest in a trust, the corpus of which consists
primarily of receivables generated from time to time in the ordinary course of
business in a portfolio of consumer revolving credit card accounts by

                                CAPITAL ONE BANK

and, in certain circumstances, certain Additional Sellers (as defined in the
Pooling and Servicing Agreement referred to below).

             (Not an interest in or obligation of Capital One Bank,
                 any Additional Seller or any affiliate thereof)

                  This certifies that CEDE & CO. (the "Class A
Certificateholder") is the registered owner of a fractional undivided interest
in certain assets of a trust (the "Trust") created pursuant to the Pooling and
Servicing Agreement dated as of September 30, 1993 (as amended and supplemented,
the "Agreement"), as supplemented by the Series 1998-4 Supplement dated as of
<PAGE>
 
November 17, 1998 (as amended and supplemented, the "Series Supplement"), among
Capital One Bank, as Seller and Servicer, and The Bank of New York, a New York
banking corporation, as trustee (the "Trustee"). The corpus of the Trust
consists of (i) a portfolio of all receivables (the "Receivables") existing in
the consumer revolving credit card accounts and other consumer revolving credit
accounts identified under the Agreement from time to time (the "Accounts"), 
(ii) all Receivables generated under the Accounts from time to time thereafter,
(iii) funds collected or to be collected from accountholders in respect of the
Receivables, (iv) all funds which are from time to time on deposit in the
Collection Account and in the Series Accounts, (v) an interest in any Funds
Collateral relating to secured accounts, (vi) the benefits of any Series
Enhancement and (vii) all other assets and interests constituting the Trust. The
Holder of this Class A Certificate is entitled to the benefit of funds on
deposit in a Cash Collateral Account and any Series Enhancement to the extent
provided in the Series Supplement. Although a summary of certain provisions of
the Agreement and the Series Supplement is set forth below and on the Summary of
Terms and Conditions attached hereto and made a part hereof, this Class A
Certificate does not purport to summarize the Agreement and the Series
Supplement and reference is made to the Agreement and the Series Supplement for
information with respect to the interests, rights, benefits, obligations,
proceeds and duties evidenced hereby and the rights, duties and obligations of
the Trustee. A copy of the Agreement and the Series Supplement (without
schedules) may be requested from the Trustee by writing to the Trustee at the
Corporate Trust Office. To the extent not defined herein, the capitalized terms
used herein have the meanings ascribed to them in the Agreement or the Series
Supplement, as applicable.

                  This Class A Certificate is issued under and is subject to the
terms, provisions and conditions of the Agreement and the Series Supplement, to
which Agreement and Series Supplement, each as amended and supplemented from
time to time, the Class A Certificateholder by virtue of the acceptance hereof
assents and is bound.

                  It is the intent of the Seller and the Investor
Certificateholders that, for federal, state and local income and franchise tax
purposes only, the Investor Certificates will qualify as indebtedness of the
Seller secured by the Receivables. The Class A Certificateholder, by the
acceptance of this Class A Certificate, agrees to treat this Class A Certificate
for federal, state and local income and franchise tax purposes as indebtedness
of the Seller.

                  In general, payments of principal with respect to the Class A
Certificates are limited to the Class A Invested Amount, which may be less than
the unpaid principal balance of the Class A Certificates. The Class A Expected
Final Payment Date is the November 2003 Distribution Date, but principal with
respect to the Class A Certificates may be paid earlier or later under certain
circumstances described in the Agreement and the Series Supplement. If for

                                       2
<PAGE>
 
one or more months during the Class A Accumulation Period there are not
sufficient funds to pay the Controlled Deposit Amount, then to the extent that
excess funds are not available on subsequent Distribution Dates with respect to
the Class A Accumulation Period to make up for such shortfalls, the final
payment of principal of the Class A Certificates will occur later than the Class
A Expected Final Payment Date.

          Unless the certificate of authentication hereon has been executed by
or on behalf of the Trustee, by manual signature, this Class A Certificate shall
not be entitled to any benefit under the Agreement or the Series Supplement or
be valid for any purpose.

          IN WITNESS WHEREOF, the Seller has caused this Class A Certificate to
be duly executed.

  
                                    CAPITAL ONE BANK


                                    By:/s/ Charles Kim 
                                       ----------------------------------
                                       Name:   Charles Kim
                                       Title:  Director of Securitization


Dated: November 17, 1998
<PAGE>
 
                    TRUSTEE'S CERTIFICATE OF AUTHENTICATION

          This is one of the Class A Certificates described in the within-
mentioned Agreement and Series Supplement.


                              THE BANK OF NEW YORK,
                               as Trustee


                              By: /s/ Cheryl Laser
                                 --------------------------
                                 Authorized Officer


                              or


                              By:
                                 --------------------------
                                 as Authenticating Agent
                                 for the Trustee


                              By:
                                 --------------------------
                                 Authorized Officer
<PAGE>
 
                           CAPITAL ONE MASTER TRUST

                                 SERIES 1998-4

                    CLASS A 5.43% ASSET BACKED CERTIFICATE

                        Summary of Terms and Conditions


          The Receivables consist of Principal Receivables which arise generally
from the purchase of goods and services and amounts advanced to accountholders
as cash advances and Finance Charge Receivables.  This Class A Certificate is
one of a Series of Investor Certificates entitled "Capital One Master Trust,
Series 1998-4."  The Series1998-4 Certificates are being issued in two Classes,
the first of which is known as the "Class A 5.43% Asset Backed Certificates,
Series 1998-4" (the "Class A Certificates") and the second Class is known as the
"Class B Floating Rate Asset Backed Certificates, Series 1998-4" (the  "Class B
Certificates").  In addition, as part of Series 1998-4, the Trust is creating a
third Class of uncertificated interests in the Trust which uncertificated
interests, except as expressly provided in the Series Supplement, are deemed to
be "Investor Certificates" and are known as the "Class C Floating Rate Asset
Backed Interests, Series 1998-4" (the "Class C Interests").  This Class A
Certificate represents a fractional undivided interest in certain assets of the
Trust.  The Trust Assets are allocated in part to the certificateholders of all
outstanding Series (the "Certificateholders' Interest") with the remainder
allocated to the Seller's Interest.  The aggregate interest represented by the
Class A  Certificates at any time in the Principal Receivables in the Trust
shall not exceed an amount equal to the Class A Invested Amount at such time.
The Class A Initial Invested Amount is $631,875,000.  The Class A Invested
Amount on any date will be an amount equal to (a) the Class A Initial Invested
Amount, minus (b) the aggregate amount of principal payments made to the Class A
Certificateholders on or prior to such date, minus (c) the excess, if any, of
the aggregate amount of Class A Investor Charge-Offs for all prior Distribution
Dates over the aggregate amount of Class A Investor Charge-Offs reimbursed
pursuant to Section 4.06(a) of the Series Supplement prior to such date.  Also,
a Seller's Certificate has been issued to Capital One Bank pursuant to the
Agreement which represents the Seller's Interest on the date hereof.

          Subject to the terms and conditions of the Agreement, the Seller may
from time to time direct the Trustee, on behalf of the Trust, to issue one or
more new Series of Investor Certificates, which will represent fractional
undivided interests in certain of the Trust Assets.

          On each Payment Date, the Paying Agent shall distribute to each Class
A Certificateholder of record on the last day of the preceding calendar month
(each a "Record Date") such Class A Certificateholder's pro rata share of such
amounts (including amounts on deposit in the Collection Account and the
Principal Funding Account) as are payable to the Class A Certificateholders
pursuant to the Agreement and the Series Supplement.  Distributions with respect
to this Class A Certificate will be made by the Paying Agent by check mailed to
the address of the Class A Certificateholder of record appearing in the
Certificate Register without the presentation or surrender of this Class A
Certificate or the making of any notation thereon 


                                       5
<PAGE>
 
(except for the final distribution in respect of this Class A Certificate),
except that with respect to Class A Certificates registered in the name of Cede
& Co., the nominee for The Depository Trust Company, distributions will be made
in the form of immediately available funds. Final payment of this Class A
Certificate will be made only upon presentation and surrender of this Class A
Certificate at the office or agency specified in the notice of final
distribution delivered by the Trustee to the Class A Certificateholders in
accordance with the Agreement and the Series Supplement.

          On any day occurring on or after the day on which the Invested Amount
is reduced to 5% or less of the Initial Invested Amount, the Seller has the
option to repurchase the Certificateholders' Interest in the Trust.  The
repurchase price will be equal to (a) if such day is a Distribution Date, the
Reassignment Amount for such Distribution Date or (b) if such day is not a
Distribution Date, the Reassignment Amount for the Distribution Date following
such day.  Following the deposit of the Reassignment Amount in the Collection
Account, Class A Certificateholders, the Class B Certificateholders and the
Class C Interest Holders will not have any interest in the Receivables and the
Class A Certificates will represent only the right to receive such Reassignment
Amount.

          This Class A Certificate does not represent an obligation of, or an
interest in, the Seller, the Servicer or any affiliate of any of them and is not
insured or guaranteed by the Federal Deposit Insurance Corporation or any other
governmental agency or instrumentality.  This Class A Certificate is limited in
right of payment to certain Collections with respect to the Receivables (and
certain other amounts), all as more specifically set forth hereinabove and in
the Agreement and the Series Supplement.

          The Agreement or any Supplement may, subject to certain conditions, be
amended by the Seller, the Servicer and the Trustee without Certificateholder
consent. The Trustee may, but shall not be obligated to, enter into any such
amendment which affects the Trustee's rights, duties or immunities under the
Agreement or otherwise.

          The Agreement or any Supplement may also be amended from time to time
by the Servicer, the Seller and the Trustee, with the consent of the Holders of
Investor Certificates evidencing not less than 66-2/3% of the aggregate unpaid
principal amount of the Investor Certificates of all adversely affected Series,
for the purpose of adding any provisions to or changing in any manner or
eliminating any of the provisions of the Agreement or any Supplement or of
modifying in any manner the rights of the Investor Certificateholders; provided,
                                                                       -------- 
however, that no such amendment shall (i) reduce in any manner the amount of or
- -------                                                                        
delay the timing of any distributions to be made to Investor Certificateholders
or deposits of amounts to be so distributed or the amount available under any
Series Enhancement without the consent of each affected Investor
Certificateholder, (ii) change the definition of or the manner of calculating
the interest of any Investor Certificateholder without the consent of each
affected Investor Certificateholder, (iii) reduce the aforesaid percentage
required to consent to any such amendment without the consent of each Investor
Certificateholder or (iv) adversely affect the rating of any Series or Class by
each Rating Agency without the consent of the Holders of Investor Certificates
of such Series or Class evidencing not less than 66-2/3% of the aggregate 


                                       6
<PAGE>
 
unpaid principal amount of the Investor Certificates of such Series or Class.
The Trustee may, but shall not be obligated to, enter into any such amendment
which affects the Trustee's rights, duties or immunities under the Agreement or
otherwise.

          The Class A Certificates are issuable only in minimum denominations of
$1,000 and integral multiples of $1,000.  The transfer of this Class A
Certificate shall be registered in the Certificate Register upon surrender of
this Class A Certificate for registration of transfer at any office or agency
maintained by the Transfer Agent and Registrar accompanied by a written
instrument of transfer, in a form satisfactory to the Trustee or the Transfer
Agent and Registrar, duly executed by the Class A Certificateholder or such
Class A Certificateholder's attorney, and duly authorized in writing with such
signature guaranteed, and thereupon one or more new Class A Certificates of
authorized denominations and for the same aggregate fractional undivided
interest will be issued to the designated transferee or transferees.

          As provided in the Agreement and subject to certain limitations
therein set forth, Class A Certificates are exchangeable for new Class A
Certificates evidencing like aggregate fractional undivided interests as
requested by the Class A Certificateholder surrendering such Class A
Certificates.  No service charge may be imposed for any such exchange but the
Servicer or Transfer Agent and Registrar may require payment of a sum sufficient
to cover any tax or other governmental charge that may be imposed in connection
therewith.

          The Servicer, the Trustee, the Paying Agent and the Transfer Agent and
Registrar and any agent of any of them, may treat the person in whose name this
Class A Certificate is registered as the owner hereof for all purposes, and
neither the Servicer nor the Trustee, the Paying Agent, the Transfer Agent and
Registrar, nor any agent of any of them, shall be affected by notice to the
contrary except in certain circumstances described in the Agreement.

          THIS CLASS A CERTIFICATE SHALL BE CONSTRUED IN ACCORDANCE WITH THE
LAWS OF THE STATE OF NEW YORK, WITHOUT REFERENCE TO ITS CONFLICT OF LAW
PROVISIONS, AND THE OBLIGATIONS, RIGHTS AND REMEDIES OF THE PARTIES HEREUNDER
SHALL BE DETERMINED IN ACCORDANCE WITH SUCH LAWS.


                                       7
<PAGE>
 
                                  ASSIGNMENT


Social Security or other identifying number of assignee _____________________

          FOR VALUE RECEIVED, the undersigned hereby sells, assigns and
transfers unto ______________________________________________________________
                        (name and address of assignee)

the within certificate and all rights thereunder, and hereby irrevocably
constitutes and appoints ______________________, attorney, to transfer said
certificate on the books kept for registration thereof, with full power of
substitution in the premises.



Dated: _____________________*


Signature Guaranteed:


____________________________











- ----------------------------
*NOTE:  The signature to this assignment must correspond with the name of the
registered owner as it appears on the face of the within Certificate in every
particular, without alteration, enlargement or any change whatsoever.
<PAGE>

REGISTERED                                                          $200,000,000

NO. R-A-3

                                                           CUSIP No. 14040K AM 0

                  Unless this Class A 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.

                            CAPITAL ONE MASTER TRUST

                                  Series 1998-4

                     CLASS A 5.43% ASSET BACKED CERTIFICATE

                      Class A Expected Final Payment Date:
                       The November 2003 Distribution Date

                  Each $1,000 minimum denomination represents a
                          1/631,875 undivided interest
                            in certain assets of the

                            CAPITAL ONE MASTER TRUST

Evidencing an undivided interest in a trust, the corpus of which consists
primarily of receivables generated from time to time in the ordinary course of
business in a portfolio of consumer revolving credit card accounts by

                                CAPITAL ONE BANK

and, in certain circumstances, certain Additional Sellers (as defined in the
Pooling and Servicing Agreement referred to below).

             (Not an interest in or obligation of Capital One Bank,
                 any Additional Seller or any affiliate thereof)

                  This certifies that CEDE & CO. (the "Class A
Certificateholder") is the registered owner of a fractional undivided interest
in certain assets of a trust (the "Trust") created pursuant to the Pooling and
Servicing Agreement dated as of September 30, 1993 (as amended and supplemented,
the "Agreement"), as supplemented by the Series 1998-4 Supplement dated as of
<PAGE>
 
November 17, 1998 (as amended and supplemented, the "Series Supplement"), among
Capital One Bank, as Seller and Servicer, and The Bank of New York, a New York
banking corporation, as trustee (the "Trustee"). The corpus of the Trust
consists of (i) a portfolio of all receivables (the "Receivables") existing in
the consumer revolving credit card accounts and other consumer revolving credit
accounts identified under the Agreement from time to time (the "Accounts"), 
(ii) all Receivables generated under the Accounts from time to time thereafter,
(iii) funds collected or to be collected from accountholders in respect of the
Receivables, (iv) all funds which are from time to time on deposit in the
Collection Account and in the Series Accounts, (v) an interest in any Funds
Collateral relating to secured accounts, (vi) the benefits of any Series
Enhancement and (vii) all other assets and interests constituting the Trust. The
Holder of this Class A Certificate is entitled to the benefit of funds on
deposit in a Cash Collateral Account and any Series Enhancement to the extent
provided in the Series Supplement. Although a summary of certain provisions of
the Agreement and the Series Supplement is set forth below and on the Summary of
Terms and Conditions attached hereto and made a part hereof, this Class A
Certificate does not purport to summarize the Agreement and the Series
Supplement and reference is made to the Agreement and the Series Supplement for
information with respect to the interests, rights, benefits, obligations,
proceeds and duties evidenced hereby and the rights, duties and obligations of
the Trustee. A copy of the Agreement and the Series Supplement (without
schedules) may be requested from the Trustee by writing to the Trustee at the
Corporate Trust Office. To the extent not defined herein, the capitalized terms
used herein have the meanings ascribed to them in the Agreement or the Series
Supplement, as applicable.

                  This Class A Certificate is issued under and is subject to the
terms, provisions and conditions of the Agreement and the Series Supplement, to
which Agreement and Series Supplement, each as amended and supplemented from
time to time, the Class A Certificateholder by virtue of the acceptance hereof
assents and is bound.

                  It is the intent of the Seller and the Investor
Certificateholders that, for federal, state and local income and franchise tax
purposes only, the Investor Certificates will qualify as indebtedness of the
Seller secured by the Receivables. The Class A Certificateholder, by the
acceptance of this Class A Certificate, agrees to treat this Class A Certificate
for federal, state and local income and franchise tax purposes as indebtedness
of the Seller.

                  In general, payments of principal with respect to the Class A
Certificates are limited to the Class A Invested Amount, which may be less than
the unpaid principal balance of the Class A Certificates. The Class A Expected
Final Payment Date is the November 2003 Distribution Date, but principal with
respect to the Class A Certificates may be paid earlier or later under certain
circumstances described in the Agreement and the Series Supplement. If for

                                       2

<PAGE>
 
one or more months during the Class A Accumulation Period there are not
sufficient funds to pay the Controlled Deposit Amount, then to the extent that
excess funds are not available on subsequent Distribution Dates with respect to
the Class A Accumulation Period to make up for such shortfalls, the final
payment of principal of the Class A Certificates will occur later than the Class
A Expected Final Payment Date.

          Unless the certificate of authentication hereon has been executed by
or on behalf of the Trustee, by manual signature, this Class A Certificate shall
not be entitled to any benefit under the Agreement or the Series Supplement or
be valid for any purpose.

          IN WITNESS WHEREOF, the Seller has caused this Class A Certificate to
be duly executed.

  
                                    CAPITAL ONE BANK


                                    By:/s/ Charles Kim 
                                       ----------------------------------
                                       Name:   Charles Kim
                                       Title:  Director of Securitization


Dated: November 17, 1998

<PAGE>
 
                    TRUSTEE'S CERTIFICATE OF AUTHENTICATION

          This is one of the Class A Certificates described in the within-
mentioned Agreement and Series Supplement.


                              THE BANK OF NEW YORK,
                               as Trustee


                              By: /s/ Cheryl Laser
                                 --------------------------
                                 Authorized Officer


                              or


                              By:
                                 --------------------------
                                 as Authenticating Agent
                                 for the Trustee


                              By:
                                 --------------------------
                                 Authorized Officer

<PAGE>
 
                           CAPITAL ONE MASTER TRUST

                                 SERIES 1998-4

                    CLASS A 5.43% ASSET BACKED CERTIFICATE

                        Summary of Terms and Conditions


          The Receivables consist of Principal Receivables which arise generally
from the purchase of goods and services and amounts advanced to accountholders
as cash advances and Finance Charge Receivables.  This Class A Certificate is
one of a Series of Investor Certificates entitled "Capital One Master Trust,
Series 1998-4."  The Series1998-4 Certificates are being issued in two Classes,
the first of which is known as the "Class A 5.43% Asset Backed Certificates,
Series 1998-4" (the "Class A Certificates") and the second Class is known as the
"Class B Floating Rate Asset Backed Certificates, Series 1998-4" (the  "Class B
Certificates").  In addition, as part of Series 1998-4, the Trust is creating a
third Class of uncertificated interests in the Trust which uncertificated
interests, except as expressly provided in the Series Supplement, are deemed to
be "Investor Certificates" and are known as the "Class C Floating Rate Asset
Backed Interests, Series 1998-4" (the "Class C Interests").  This Class A
Certificate represents a fractional undivided interest in certain assets of the
Trust.  The Trust Assets are allocated in part to the certificateholders of all
outstanding Series (the "Certificateholders' Interest") with the remainder
allocated to the Seller's Interest.  The aggregate interest represented by the
Class A  Certificates at any time in the Principal Receivables in the Trust
shall not exceed an amount equal to the Class A Invested Amount at such time.
The Class A Initial Invested Amount is $631,875,000.  The Class A Invested
Amount on any date will be an amount equal to (a) the Class A Initial Invested
Amount, minus (b) the aggregate amount of principal payments made to the Class A
Certificateholders on or prior to such date, minus (c) the excess, if any, of
the aggregate amount of Class A Investor Charge-Offs for all prior Distribution
Dates over the aggregate amount of Class A Investor Charge-Offs reimbursed
pursuant to Section 4.06(a) of the Series Supplement prior to such date.  Also,
a Seller's Certificate has been issued to Capital One Bank pursuant to the
Agreement which represents the Seller's Interest on the date hereof.

          Subject to the terms and conditions of the Agreement, the Seller may
from time to time direct the Trustee, on behalf of the Trust, to issue one or
more new Series of Investor Certificates, which will represent fractional
undivided interests in certain of the Trust Assets.

          On each Payment Date, the Paying Agent shall distribute to each Class
A Certificateholder of record on the last day of the preceding calendar month
(each a "Record Date") such Class A Certificateholder's pro rata share of such
amounts (including amounts on deposit in the Collection Account and the
Principal Funding Account) as are payable to the Class A Certificateholders
pursuant to the Agreement and the Series Supplement.  Distributions with respect
to this Class A Certificate will be made by the Paying Agent by check mailed to
the address of the Class A Certificateholder of record appearing in the
Certificate Register without the presentation or surrender of this Class A
Certificate or the making of any notation thereon 


                                       5

<PAGE>
 
(except for the final distribution in respect of this Class A Certificate),
except that with respect to Class A Certificates registered in the name of Cede
& Co., the nominee for The Depository Trust Company, distributions will be made
in the form of immediately available funds. Final payment of this Class A
Certificate will be made only upon presentation and surrender of this Class A
Certificate at the office or agency specified in the notice of final
distribution delivered by the Trustee to the Class A Certificateholders in
accordance with the Agreement and the Series Supplement.

          On any day occurring on or after the day on which the Invested Amount
is reduced to 5% or less of the Initial Invested Amount, the Seller has the
option to repurchase the Certificateholders' Interest in the Trust.  The
repurchase price will be equal to (a) if such day is a Distribution Date, the
Reassignment Amount for such Distribution Date or (b) if such day is not a
Distribution Date, the Reassignment Amount for the Distribution Date following
such day.  Following the deposit of the Reassignment Amount in the Collection
Account, Class A Certificateholders, the Class B Certificateholders and the
Class C Interest Holders will not have any interest in the Receivables and the
Class A Certificates will represent only the right to receive such Reassignment
Amount.

          This Class A Certificate does not represent an obligation of, or an
interest in, the Seller, the Servicer or any affiliate of any of them and is not
insured or guaranteed by the Federal Deposit Insurance Corporation or any other
governmental agency or instrumentality.  This Class A Certificate is limited in
right of payment to certain Collections with respect to the Receivables (and
certain other amounts), all as more specifically set forth hereinabove and in
the Agreement and the Series Supplement.

          The Agreement or any Supplement may, subject to certain conditions, be
amended by the Seller, the Servicer and the Trustee without Certificateholder
consent. The Trustee may, but shall not be obligated to, enter into any such
amendment which affects the Trustee's rights, duties or immunities under the
Agreement or otherwise.

          The Agreement or any Supplement may also be amended from time to time
by the Servicer, the Seller and the Trustee, with the consent of the Holders of
Investor Certificates evidencing not less than 66-2/3% of the aggregate unpaid
principal amount of the Investor Certificates of all adversely affected Series,
for the purpose of adding any provisions to or changing in any manner or
eliminating any of the provisions of the Agreement or any Supplement or of
modifying in any manner the rights of the Investor Certificateholders; provided,
                                                                       -------- 
however, that no such amendment shall (i) reduce in any manner the amount of or
- -------                                                                        
delay the timing of any distributions to be made to Investor Certificateholders
or deposits of amounts to be so distributed or the amount available under any
Series Enhancement without the consent of each affected Investor
Certificateholder, (ii) change the definition of or the manner of calculating
the interest of any Investor Certificateholder without the consent of each
affected Investor Certificateholder, (iii) reduce the aforesaid percentage
required to consent to any such amendment without the consent of each Investor
Certificateholder or (iv) adversely affect the rating of any Series or Class by
each Rating Agency without the consent of the Holders of Investor Certificates
of such Series or Class evidencing not less than 66-2/3% of the aggregate 


                                       6

<PAGE>
 
unpaid principal amount of the Investor Certificates of such Series or Class.
The Trustee may, but shall not be obligated to, enter into any such amendment
which affects the Trustee's rights, duties or immunities under the Agreement or
otherwise.

          The Class A Certificates are issuable only in minimum denominations of
$1,000 and integral multiples of $1,000.  The transfer of this Class A
Certificate shall be registered in the Certificate Register upon surrender of
this Class A Certificate for registration of transfer at any office or agency
maintained by the Transfer Agent and Registrar accompanied by a written
instrument of transfer, in a form satisfactory to the Trustee or the Transfer
Agent and Registrar, duly executed by the Class A Certificateholder or such
Class A Certificateholder's attorney, and duly authorized in writing with such
signature guaranteed, and thereupon one or more new Class A Certificates of
authorized denominations and for the same aggregate fractional undivided
interest will be issued to the designated transferee or transferees.

          As provided in the Agreement and subject to certain limitations
therein set forth, Class A Certificates are exchangeable for new Class A
Certificates evidencing like aggregate fractional undivided interests as
requested by the Class A Certificateholder surrendering such Class A
Certificates.  No service charge may be imposed for any such exchange but the
Servicer or Transfer Agent and Registrar may require payment of a sum sufficient
to cover any tax or other governmental charge that may be imposed in connection
therewith.

          The Servicer, the Trustee, the Paying Agent and the Transfer Agent and
Registrar and any agent of any of them, may treat the person in whose name this
Class A Certificate is registered as the owner hereof for all purposes, and
neither the Servicer nor the Trustee, the Paying Agent, the Transfer Agent and
Registrar, nor any agent of any of them, shall be affected by notice to the
contrary except in certain circumstances described in the Agreement.

          THIS CLASS A CERTIFICATE SHALL BE CONSTRUED IN ACCORDANCE WITH THE
LAWS OF THE STATE OF NEW YORK, WITHOUT REFERENCE TO ITS CONFLICT OF LAW
PROVISIONS, AND THE OBLIGATIONS, RIGHTS AND REMEDIES OF THE PARTIES HEREUNDER
SHALL BE DETERMINED IN ACCORDANCE WITH SUCH LAWS.


                                       7

<PAGE>
 
                                  ASSIGNMENT


Social Security or other identifying number of assignee _____________________

          FOR VALUE RECEIVED, the undersigned hereby sells, assigns and
transfers unto ______________________________________________________________
                        (name and address of assignee)

the within certificate and all rights thereunder, and hereby irrevocably
constitutes and appoints ______________________, attorney, to transfer said
certificate on the books kept for registration thereof, with full power of
substitution in the premises.



Dated: _____________________*


Signature Guaranteed:


____________________________











- ----------------------------
*NOTE:  The signature to this assignment must correspond with the name of the
registered owner as it appears on the face of the within Certificate in every
particular, without alteration, enlargement or any change whatsoever.
 

<PAGE>

REGISTERED                                                          $31,875,000

NO. R-A-4

                                                           CUSIP No. 14040K AM 0

                  Unless this Class A 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.

                            CAPITAL ONE MASTER TRUST

                                  Series 1998-4

                     CLASS A 5.43% ASSET BACKED CERTIFICATE

                      Class A Expected Final Payment Date:
                       The November 2003 Distribution Date

                  Each $1,000 minimum denomination represents a
                          1/631,875 undivided interest
                            in certain assets of the

                            CAPITAL ONE MASTER TRUST

Evidencing an undivided interest in a trust, the corpus of which consists
primarily of receivables generated from time to time in the ordinary course of
business in a portfolio of consumer revolving credit card accounts by

                                CAPITAL ONE BANK

and, in certain circumstances, certain Additional Sellers (as defined in the
Pooling and Servicing Agreement referred to below).

             (Not an interest in or obligation of Capital One Bank,
                 any Additional Seller or any affiliate thereof)

                  This certifies that CEDE & CO. (the "Class A
Certificateholder") is the registered owner of a fractional undivided interest
in certain assets of a trust (the "Trust") created pursuant to the Pooling and
Servicing Agreement dated as of September 30, 1993 (as amended and supplemented,
the "Agreement"), as supplemented by the Series 1998-4 Supplement dated as of
<PAGE>
 
November 17, 1998 (as amended and supplemented, the "Series Supplement"), among
Capital One Bank, as Seller and Servicer, and The Bank of New York, a New York
banking corporation, as trustee (the "Trustee"). The corpus of the Trust
consists of (i) a portfolio of all receivables (the "Receivables") existing in
the consumer revolving credit card accounts and other consumer revolving credit
accounts identified under the Agreement from time to time (the "Accounts"), 
(ii) all Receivables generated under the Accounts from time to time thereafter,
(iii) funds collected or to be collected from accountholders in respect of the
Receivables, (iv) all funds which are from time to time on deposit in the
Collection Account and in the Series Accounts, (v) an interest in any Funds
Collateral relating to secured accounts, (vi) the benefits of any Series
Enhancement and (vii) all other assets and interests constituting the Trust. The
Holder of this Class A Certificate is entitled to the benefit of funds on
deposit in a Cash Collateral Account and any Series Enhancement to the extent
provided in the Series Supplement. Although a summary of certain provisions of
the Agreement and the Series Supplement is set forth below and on the Summary of
Terms and Conditions attached hereto and made a part hereof, this Class A
Certificate does not purport to summarize the Agreement and the Series
Supplement and reference is made to the Agreement and the Series Supplement for
information with respect to the interests, rights, benefits, obligations,
proceeds and duties evidenced hereby and the rights, duties and obligations of
the Trustee. A copy of the Agreement and the Series Supplement (without
schedules) may be requested from the Trustee by writing to the Trustee at the
Corporate Trust Office. To the extent not defined herein, the capitalized terms
used herein have the meanings ascribed to them in the Agreement or the Series
Supplement, as applicable.

                  This Class A Certificate is issued under and is subject to the
terms, provisions and conditions of the Agreement and the Series Supplement, to
which Agreement and Series Supplement, each as amended and supplemented from
time to time, the Class A Certificateholder by virtue of the acceptance hereof
assents and is bound.

                  It is the intent of the Seller and the Investor
Certificateholders that, for federal, state and local income and franchise tax
purposes only, the Investor Certificates will qualify as indebtedness of the
Seller secured by the Receivables. The Class A Certificateholder, by the
acceptance of this Class A Certificate, agrees to treat this Class A Certificate
for federal, state and local income and franchise tax purposes as indebtedness
of the Seller.

                  In general, payments of principal with respect to the Class A
Certificates are limited to the Class A Invested Amount, which may be less than
the unpaid principal balance of the Class A Certificates. The Class A Expected
Final Payment Date is the November 2003 Distribution Date, but principal with
respect to the Class A Certificates may be paid earlier or later under certain
circumstances described in the Agreement and the Series Supplement. If for

                                       2
<PAGE>
 
one or more months during the Class A Accumulation Period there are not
sufficient funds to pay the Controlled Deposit Amount, then to the extent that
excess funds are not available on subsequent Distribution Dates with respect to
the Class A Accumulation Period to make up for such shortfalls, the final
payment of principal of the Class A Certificates will occur later than the Class
A Expected Final Payment Date.

          Unless the certificate of authentication hereon has been executed by
or on behalf of the Trustee, by manual signature, this Class A Certificate shall
not be entitled to any benefit under the Agreement or the Series Supplement or
be valid for any purpose.

          IN WITNESS WHEREOF, the Seller has caused this Class A Certificate to
be duly executed.

  
                                    CAPITAL ONE BANK


                                    By:/s/ Charles Kim 
                                       ----------------------------------
                                       Name:   Charles Kim
                                       Title:  Director of Securitization


Dated: November 17, 1998
<PAGE>
 
                    TRUSTEE'S CERTIFICATE OF AUTHENTICATION

          This is one of the Class A Certificates described in the within-
mentioned Agreement and Series Supplement.


                              THE BANK OF NEW YORK,
                               as Trustee


                              By: /s/ Cheryl Laser
                                 --------------------------
                                 Authorized Officer


                              or


                              By:
                                 --------------------------
                                 as Authenticating Agent
                                 for the Trustee


                              By:
                                 --------------------------
                                 Authorized Officer
<PAGE>
 
                           CAPITAL ONE MASTER TRUST

                                 SERIES 1998-4

                    CLASS A 5.43% ASSET BACKED CERTIFICATE

                        Summary of Terms and Conditions


          The Receivables consist of Principal Receivables which arise generally
from the purchase of goods and services and amounts advanced to accountholders
as cash advances and Finance Charge Receivables.  This Class A Certificate is
one of a Series of Investor Certificates entitled "Capital One Master Trust,
Series 1998-4."  The Series1998-4 Certificates are being issued in two Classes,
the first of which is known as the "Class A 5.43% Asset Backed Certificates,
Series 1998-4" (the "Class A Certificates") and the second Class is known as the
"Class B Floating Rate Asset Backed Certificates, Series 1998-4" (the  "Class B
Certificates").  In addition, as part of Series 1998-4, the Trust is creating a
third Class of uncertificated interests in the Trust which uncertificated
interests, except as expressly provided in the Series Supplement, are deemed to
be "Investor Certificates" and are known as the "Class C Floating Rate Asset
Backed Interests, Series 1998-4" (the "Class C Interests").  This Class A
Certificate represents a fractional undivided interest in certain assets of the
Trust.  The Trust Assets are allocated in part to the certificateholders of all
outstanding Series (the "Certificateholders' Interest") with the remainder
allocated to the Seller's Interest.  The aggregate interest represented by the
Class A  Certificates at any time in the Principal Receivables in the Trust
shall not exceed an amount equal to the Class A Invested Amount at such time.
The Class A Initial Invested Amount is $631,875,000.  The Class A Invested
Amount on any date will be an amount equal to (a) the Class A Initial Invested
Amount, minus (b) the aggregate amount of principal payments made to the Class A
Certificateholders on or prior to such date, minus (c) the excess, if any, of
the aggregate amount of Class A Investor Charge-Offs for all prior Distribution
Dates over the aggregate amount of Class A Investor Charge-Offs reimbursed
pursuant to Section 4.06(a) of the Series Supplement prior to such date.  Also,
a Seller's Certificate has been issued to Capital One Bank pursuant to the
Agreement which represents the Seller's Interest on the date hereof.

          Subject to the terms and conditions of the Agreement, the Seller may
from time to time direct the Trustee, on behalf of the Trust, to issue one or
more new Series of Investor Certificates, which will represent fractional
undivided interests in certain of the Trust Assets.

          On each Payment Date, the Paying Agent shall distribute to each Class
A Certificateholder of record on the last day of the preceding calendar month
(each a "Record Date") such Class A Certificateholder's pro rata share of such
amounts (including amounts on deposit in the Collection Account and the
Principal Funding Account) as are payable to the Class A Certificateholders
pursuant to the Agreement and the Series Supplement.  Distributions with respect
to this Class A Certificate will be made by the Paying Agent by check mailed to
the address of the Class A Certificateholder of record appearing in the
Certificate Register without the presentation or surrender of this Class A
Certificate or the making of any notation thereon 


                                       5
<PAGE>
 
(except for the final distribution in respect of this Class A Certificate),
except that with respect to Class A Certificates registered in the name of Cede
& Co., the nominee for The Depository Trust Company, distributions will be made
in the form of immediately available funds. Final payment of this Class A
Certificate will be made only upon presentation and surrender of this Class A
Certificate at the office or agency specified in the notice of final
distribution delivered by the Trustee to the Class A Certificateholders in
accordance with the Agreement and the Series Supplement.

          On any day occurring on or after the day on which the Invested Amount
is reduced to 5% or less of the Initial Invested Amount, the Seller has the
option to repurchase the Certificateholders' Interest in the Trust.  The
repurchase price will be equal to (a) if such day is a Distribution Date, the
Reassignment Amount for such Distribution Date or (b) if such day is not a
Distribution Date, the Reassignment Amount for the Distribution Date following
such day.  Following the deposit of the Reassignment Amount in the Collection
Account, Class A Certificateholders, the Class B Certificateholders and the
Class C Interest Holders will not have any interest in the Receivables and the
Class A Certificates will represent only the right to receive such Reassignment
Amount.

          This Class A Certificate does not represent an obligation of, or an
interest in, the Seller, the Servicer or any affiliate of any of them and is not
insured or guaranteed by the Federal Deposit Insurance Corporation or any other
governmental agency or instrumentality.  This Class A Certificate is limited in
right of payment to certain Collections with respect to the Receivables (and
certain other amounts), all as more specifically set forth hereinabove and in
the Agreement and the Series Supplement.

          The Agreement or any Supplement may, subject to certain conditions, be
amended by the Seller, the Servicer and the Trustee without Certificateholder
consent. The Trustee may, but shall not be obligated to, enter into any such
amendment which affects the Trustee's rights, duties or immunities under the
Agreement or otherwise.

          The Agreement or any Supplement may also be amended from time to time
by the Servicer, the Seller and the Trustee, with the consent of the Holders of
Investor Certificates evidencing not less than 66-2/3% of the aggregate unpaid
principal amount of the Investor Certificates of all adversely affected Series,
for the purpose of adding any provisions to or changing in any manner or
eliminating any of the provisions of the Agreement or any Supplement or of
modifying in any manner the rights of the Investor Certificateholders; provided,
                                                                       -------- 
however, that no such amendment shall (i) reduce in any manner the amount of or
- -------                                                                        
delay the timing of any distributions to be made to Investor Certificateholders
or deposits of amounts to be so distributed or the amount available under any
Series Enhancement without the consent of each affected Investor
Certificateholder, (ii) change the definition of or the manner of calculating
the interest of any Investor Certificateholder without the consent of each
affected Investor Certificateholder, (iii) reduce the aforesaid percentage
required to consent to any such amendment without the consent of each Investor
Certificateholder or (iv) adversely affect the rating of any Series or Class by
each Rating Agency without the consent of the Holders of Investor Certificates
of such Series or Class evidencing not less than 66-2/3% of the aggregate 


                                       6
<PAGE>
 
unpaid principal amount of the Investor Certificates of such Series or Class.
The Trustee may, but shall not be obligated to, enter into any such amendment
which affects the Trustee's rights, duties or immunities under the Agreement or
otherwise.

          The Class A Certificates are issuable only in minimum denominations of
$1,000 and integral multiples of $1,000.  The transfer of this Class A
Certificate shall be registered in the Certificate Register upon surrender of
this Class A Certificate for registration of transfer at any office or agency
maintained by the Transfer Agent and Registrar accompanied by a written
instrument of transfer, in a form satisfactory to the Trustee or the Transfer
Agent and Registrar, duly executed by the Class A Certificateholder or such
Class A Certificateholder's attorney, and duly authorized in writing with such
signature guaranteed, and thereupon one or more new Class A Certificates of
authorized denominations and for the same aggregate fractional undivided
interest will be issued to the designated transferee or transferees.

          As provided in the Agreement and subject to certain limitations
therein set forth, Class A Certificates are exchangeable for new Class A
Certificates evidencing like aggregate fractional undivided interests as
requested by the Class A Certificateholder surrendering such Class A
Certificates.  No service charge may be imposed for any such exchange but the
Servicer or Transfer Agent and Registrar may require payment of a sum sufficient
to cover any tax or other governmental charge that may be imposed in connection
therewith.

          The Servicer, the Trustee, the Paying Agent and the Transfer Agent and
Registrar and any agent of any of them, may treat the person in whose name this
Class A Certificate is registered as the owner hereof for all purposes, and
neither the Servicer nor the Trustee, the Paying Agent, the Transfer Agent and
Registrar, nor any agent of any of them, shall be affected by notice to the
contrary except in certain circumstances described in the Agreement.

          THIS CLASS A CERTIFICATE SHALL BE CONSTRUED IN ACCORDANCE WITH THE
LAWS OF THE STATE OF NEW YORK, WITHOUT REFERENCE TO ITS CONFLICT OF LAW
PROVISIONS, AND THE OBLIGATIONS, RIGHTS AND REMEDIES OF THE PARTIES HEREUNDER
SHALL BE DETERMINED IN ACCORDANCE WITH SUCH LAWS.


                                       7
<PAGE>
 
                                  ASSIGNMENT


Social Security or other identifying number of assignee _____________________

          FOR VALUE RECEIVED, the undersigned hereby sells, assigns and
transfers unto ______________________________________________________________
                        (name and address of assignee)

the within certificate and all rights thereunder, and hereby irrevocably
constitutes and appoints ______________________, attorney, to transfer said
certificate on the books kept for registration thereof, with full power of
substitution in the premises.



Dated: _____________________*


Signature Guaranteed:


____________________________











- ----------------------------
*NOTE:  The signature to this assignment must correspond with the name of the
registered owner as it appears on the face of the within Certificate in every
particular, without alteration, enlargement or any change whatsoever.
<PAGE>
 
REGISTERED                                                      $30,000,000  

No. R-B-1                                             CUSIP No. 14040K AN 8

          THIS CLASS B CERTIFICATE HAS NOT BEEN REGISTERED UNDER THE SECURITIES
ACT OF 1933, AS AMENDED (THE "1933 ACT").  NEITHER THIS CLASS B CERTIFICATE NOR
ANY PORTION HEREOF MAY BE OFFERED OR SOLD EXCEPT IN COMPLIANCE WITH THE
REGISTRATION PROVISIONS FOR THE 1933 ACT AND ANY APPLICABLE PROVISIONS OF ANY
STATE BLUE SKY OR SECURITIES LAWS OR PURSUANT TO AN AVAILABLE EXEMPTION FROM
SUCH REGISTRATION PROVISIONS.  THE TRANSFER OF THIS CLASS B CERTIFICATE IS
SUBJECT TO CERTAIN CONDITIONS SET FORTH IN THE POOLING AND SERVICING AGREEMENT
REFERRED TO HEREIN AND TO THE TERMS AND CONDITIONS OF THE PURCHASE AGREEMENT
DATED NOVEMBER 17, 1998.

          THIS CLASS B CERTIFICATE MAY NOT BE ACQUIRED BY OR FOR THE ACCOUNT OF
PERSONS INVESTING ASSETS OF A BENEFIT PLAN OR AN INDIVIDUAL RETIREMENT ACCOUNT
OTHER THAN AN INSURANCE COMPANY GENERAL ACCOUNT.

          Unless this Class B 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.

                           CAPITAL ONE MASTER TRUST

                                 Series 1998-4

                 CLASS B FLOATING RATE ASSET BACKED CERTIFICATE

                         Class B Expected Final Date:
                      The January 2004 Distribution Date

                     Each $1,000 denomination represents a
                          1/60,000 undivided interest
                           in certain assets of the

                           CAPITAL ONE MASTER TRUST
<PAGE>
 
Evidencing an undivided interest in a trust, the corpus of which consists
primarily of receivables generated from time to time in the ordinary course of
business in a portfolio of consumer revolving credit card accounts by CAPITAL
ONE BANK and, in certain circumstances, certain Additional Sellers (as defined
in the Pooling and Servicing Agreement referred to below).

             (Not an interest in or obligation of Capital One Bank,
                any Additional Seller or any affiliate thereof)

          This certifies that CEDE & CO. (the "Class B Certificateholder") is
the registered owner of a fractional undivided interest in certain assets of a
trust (the "Trust") created pursuant to the Pooling and Servicing Agreement
dated as of September 30, 1993 (as amended and supplemented, the "Agreement"),
as supplemented by the Series 1998-4 Supplement dated as of November 17, 1998
(as amended and supplemented, the "Series Supplement"), among Capital One Bank,
as Seller and Servicer, and The Bank of New York, a New York banking
corporation, as trustee (the "Trustee").  The corpus of the Trust consists of
(i) a portfolio of all receivables (the "Receivables") existing in the consumer
revolving credit card accounts and other consumer revolving credit accounts
identified under the Agreement from time to time (the "Accounts"), (ii) all
Receivables generated under the Accounts from time to time thereafter, (iii)
funds collected or to be collected from accountholders in respect of the
Receivables, (iv) all funds which are from time to time on deposit in the
Collection Account and in the Series Accounts, (v) an interest in any Funds
Collateral relating to secured accounts, (vi) the benefits of any Series
Enhancement and (vii) all other assets and interests constituting the Trust.
The Holder of this Class B Certificate is entitled to the benefit of funds on
deposit in a Cash Collateral Account and any Series Enhancement to the extent
provided in the Series Supplement.  Although a summary of certain provisions of
the Agreement and the Series Supplement is set forth below and on the Summary of
Terms and Conditions attached hereto and made a part hereof, this Class B
Certificate does not purport to summarize the Agreement and the Series
Supplement and reference is made to the Agreement and the Series Supplement for
information with respect to the interests, rights, benefits, obligations,
proceeds and duties evidenced hereby and the rights, duties and obligations of
the Trustee.  A copy of the Agreement and the Series Supplement (without
schedules) may be requested from the Trustee by writing to the Trustee at the
Corporate Trust Office.  To the extent not defined herein, the capitalized terms
used herein have the meanings ascribed to them in the Agreement or the Series
Supplement, as applicable.

          This Class B Certificate is issued under and is subject to the terms,
provisions and conditions of the Agreement and the Series Supplement, to which
Agreement and Series Supplement, each as amended and supplemented from time to
time, the Class B Certificateholder by virtue of the acceptance hereof assents
and is bound.

          It is the intent of the Seller and the Investor Certificateholders
that, for federal, state and local income and franchise tax purposes only, the
Investor Certificates will qualify as indebtedness of the Seller secured by the
Receivables.  The Class B Certificateholder, by the acceptance of this Class B
Certificate, agrees to treat this Class B Certificate for federal, state and
local income and franchise tax purposes as indebtedness of the Seller.

          In general, payments of principal with respect to the Class B
Certificates are limited to the Class B Invested Amount, which may be less than
the unpaid principal balance of 

                                       2
<PAGE>
 
the Class B Certificates. The Class B Expected Final Payment Date is the January
2004 Distribution Date, but principal with respect to the Class B Certificates
may be paid earlier or later under certain circumstances described in the
Agreement and the Series Supplement. Principal payments with respect to the
Class B Certificates will not commence until the Class A Invested Amount is paid
in full. In addition, the final payment of principal of the Class B Certificates
will occur later than the Class B Expected Final Payment Date if Collections of
Receivables allocable to pay principal of the Class B Certificates are
insufficient to pay the Class B Invested Amount on or prior to such Distribution
Date.

     No Class B Certificate (or any interest therein) may be acquired or held by
any employee benefit or other plan (including an individual retirement account)
that is subject to the Employee Retirement Income Security Act of 1974, as
amended ("ERISA"), or Section 4975 of the Internal Revenue Code of 1986, as
amended (each, a "Plan"), any trustee or other person acting on behalf of any
Plan, or any other person using "Plan Assets" to effect such acquisition or
holding (each, a "Plan Investor") unless (i) such acquirer or holder is an
insurance company, (ii) the source of funds used to acquire or hold such
Certificate (or interest therein) is an "insurance company general account" (as
defined in U.S. Department of Labor Prohibited Transaction Class Exemption
("PTCE") 95-60), and (iii) the conditions set forth in Sections I and III of
PTCE 95-60 have been satisfied.  By acquiring an interest in this Class B
Certificate, each Class B Certificateholder  or Certificate Owner shall be
deemed to have represented, either (i) that it is not a Plan Investor or (ii)
that (1) it is an insurance company, (2) the source of funds used to acquire or
hold an interest in such Certificate is an "insurance company general account"
(as such term is defined in PTCE 95-60), and (3) the conditions set forth in
Sections I and III of PTCE 95-60 have been satisfied.

          Unless the certificate of authentication hereon has been executed by
or on behalf of the Trustee, by manual signature, this Class B Certificate shall
not be entitled to any benefit under the Agreement or the Series Supplement or
be valid for any purpose.

                                       3
<PAGE>
 
          IN WITNESS WHEREOF, the Seller has caused this Class B Certificate to
be duly executed.


                                    CAPITAL ONE BANK


                                    By: /s/ Charles Kim
                                       ---------------------------------
                                       Name: Charles Kim
                                       Title:   Director of Securitization


Dated: November 17, 1998

                                       4
<PAGE>
 
                    TRUSTEE'S CERTIFICATE OF AUTHENTICATION


          This is one of the Class B Certificates described in the within-
mentioned Agreement and Series Supplement.


                              THE BANK OF NEW YORK,
                               as Trustee


                              By: /s/ Cheryl Laser
                                 --------------------------  
                                 Authorized Officer


                              or


                              By:
                                 --------------------------                   
                                 as Authenticating Agent
                                 for the Trustee


                              By:
                                 --------------------------  
                                 Authorized Officer

                                       5
<PAGE>
 
                           CAPITAL ONE MASTER TRUST

                                 SERIES 1998-4

                CLASS B FLOATING RATE ASSET BACKED CERTIFICATE

                        Summary of Terms and Conditions


          The Receivables consist of Principal Receivables which arise generally
from the purchase of goods and services and amounts advanced to accountholders
as cash advances and Finance Charge Receivables.  This Class B Certificate is
one of a Series of Certificates entitled "Capital One Master Trust, Series 1998-
4."  The Series1998-4 Certificates are being issued in two Classes, the first of
which is known as the "Class A 5.43% Asset Backed Certificates, Series 1998-4"
(the "Class A Certificates") and the second Class is known as the "Class B
Floating Rate Asset Backed Certificates, Series 1998-4" (the  "Class B
Certificates").  In addition, as part of Series 1998-4, the Trust is creating a
third Class of uncertificated interests in the Trust which uncertificated
interests, except as expressly provided in the Series Supplement, are deemed to
be "Investor Certificates" and are known as the "Class C Floating Rate Asset
Backed Interests, Series 1998-4" (the "Class C Interests").  This Class B
Certificate represents a fractional undivided interest in certain assets of the
Trust.  The Trust Assets are allocated in part to the certificateholders of all
outstanding Series (the "Certificateholders' Interest") with the remainder
allocated to the Seller's Interest.  The aggregate interest represented by the
Class B Certificates at any time in the Principal Receivables in the Trust shall
not exceed an amount equal to the Class B Invested Amount at such time.  The
Class B Initial Invested Amount is $60,000,000.  The Class B Invested Amount on
any date will be an amount equal to (a) the Class B Initial Invested Amount,
minus (b) the aggregate amount of principal payments made to the Class B
Certificateholders on or prior to such date, minus (c) the excess, if any, of
the aggregate amount of Class B Investor Charge-Offs for all prior Distribution
Dates over the aggregate amount of any reimbursement of Class B Investor Charge-
Offs for all Distribution Dates preceding such date, minus (d) the amount of
Reallocated Principal Collections allocated on all prior Distribution Dates
pursuant to Section 4.08(a) of the Series Supplement (excluding any Reallocated
Principal Collections that have resulted in a reduction in the Class C Invested
Amount pursuant to Section 4.06(c) of the Series Supplement), minus (e) an
amount equal to the amount by which the Class B Invested Amount has been reduced
on all prior Distribution Dates pursuant to Section 4.06(a) of the Series
Supplement and plus (f) the amount of Excess Spread and Excess Finance Charges
allocated and available on all prior Distribution Dates pursuant to Section
4.07(d) of the Series Supplement for the purpose of reimbursing amounts deducted
pursuant to the foregoing clauses (c), (d) and (e).  Also, a Seller's
Certificate has been issued to Capital One Bank pursuant to the Agreement which
represents the Seller's Interest on the date hereof.

          Subject to the terms and conditions of the Agreement, the Seller may
from time to time direct the Trustee, on behalf of the Trust, to issue one or
more new Series of Investor Certificates, which will represent fractional
undivided interests in certain of the Trust Assets.

                                       6
<PAGE>
 
          On each Payment Date, the Paying Agent shall distribute to each Class
B Certificateholder of record on the last day of the preceding calendar month
(each a "Record Date") such Class B Certificateholder's pro rata share of such
amounts (including amounts on deposit in the Collection Account and the
Principal Funding Account) as are payable to the Class B Certificateholders
pursuant to the Agreement and the Series Supplement.  Distributions with respect
to this Class B Certificate will be made by check mailed to the address of the
Class B Certificateholder of record appearing in the Certificate Register
without the presentation or surrender of this Class B Certificate or the making
of any notation thereon (except for the final distribution in respect of this
Class B Certificate) except that with respect to Class B Certificates registered
in the name of Cede & Co., the nominee for The Depository Trust Company,
distributions will be made in the form of immediately available funds.  Final
payment of this Class B Certificate will be made only upon presentation and
surrender of this Class B Certificate at the office or agency specified in the
notice of final distribution delivered by the Trustee to the Class B
Certificateholders in accordance with the Agreement and the Series Supplement.

          On any day occurring on or after the day on which the Invested Amount
is reduced to 5% or less of the Initial Invested Amount, the Seller has the
option to repurchase the Certificateholders' Interest in the Trust.  The
repurchase price will be equal to (a) if such day is a Distribution Date, the
Reassignment Amount for such Distribution Date or (b) if such day is not a
Distribution Date, the Reassignment Amount for the Distribution Date following
such day.  Following the deposit of the Reassignment Amount in the Collection
Account, the Class A Certificateholders, the Class B Certificateholders and the
Class C Interest Holders will not have any interest in the Receivables and the
Class B Certificates will represent only the right to receive such Reassignment
Amount.

          This Class B Certificate does not represent an obligation of, or an
interest in, the Seller, the Servicer or any affiliate of any of them and is not
insured or guaranteed by the Federal Deposit Insurance Corporation or any other
governmental agency or instrumentality.  This Class B Certificate is limited in
right of payment to certain Collections with respect to the Receivables (and
certain other amounts), all as more specifically set forth hereinabove and in
the Agreement and the Series Supplement.

          The Agreement or any Supplement may, subject to certain conditions, be
amended by the Seller, the Servicer and the Trustee without Certificateholder
consent. The Trustee may, but shall not be obligated to, enter into any such
amendment which affects the Trustee's rights, duties or immunities under the
Agreement or otherwise.

          The Agreement or any Supplement may also be amended from time to time
by the Servicer, the Seller and the Trustee, with the consent of the Holders of
Investor Certificates evidencing not less than 66-2/3% of the aggregate unpaid
principal amount of the Investor Certificates of all adversely affected Series,
for the purpose of adding any provisions to or changing in any manner or
eliminating any of the provisions of the Agreement or any Supplement or of
modifying in any manner the rights of the Investor Certificateholders; provided,
                                                                       -------- 
however, that no such amendment shall (i) reduce in any manner the amount of or
- -------                                                                        
delay the timing of any distributions to be made to Investor Certificateholders
or deposits of amounts to be so distributed or the amount available under any
Series Enhancement without the consent of each affected Investor
Certificateholder, (ii) change the definition of or the manner of 

                                       7
<PAGE>
 
calculating the interest of any Investor Certificateholder without the consent
of each affected Investor Certificateholder, (iii) reduce the aforesaid
percentage required to consent to any such amendment without the consent of each
Investor Certificateholder or (iv) adversely affect the rating of any Series or
Class by each Rating Agency without the consent of the Holders of Investor
Certificates of such Series or Class evidencing not less than 66-2/3% of the
aggregate unpaid principal amount of the Investor Certificates of such Series or
Class. The Trustee may, but shall not be obligated to, enter into any such
amendment which affects the Trustee's rights, duties or immunities under the
Agreement or otherwise.

          The Class B Certificates are issuable in minimum denominations of
$1,000 and integral multiples of $1,000.  The transfer of this Class B
Certificate shall be registered in the Certificate Register upon surrender of
this Class B Certificate for registration of transfer at any office or agency
maintained by the Transfer Agent and Registrar accompanied by a written
instrument of transfer, in a form satisfactory to the Trustee or the Transfer
Agent and Registrar, duly executed by the Class B Certificateholder or such
Class B Certificateholder's attorney, and duly authorized in writing with such
signature guaranteed, and thereupon one or more new Class B Certificates of
authorized denominations and for the same aggregate fractional undivided
interest will be issued to the designated transferee or transferees.

          As provided in the Agreement and subject to certain limitations
therein set forth, Class B Certificates are exchangeable for new Class B
Certificates evidencing like aggregate fractional undivided interests as
requested by the Class B Certificateholder surrendering such Class B
Certificates.  No service charge may be imposed for any such exchange but the
Servicer or Transfer Agent and Registrar may require payment of a sum sufficient
to cover any tax or other governmental charge that may be imposed in connection
therewith.

          The Servicer, the Trustee, the Paying Agent and the Transfer Agent and
Registrar and any agent of any of them, may treat the person in whose name this
Class B Certificate is registered as the owner hereof for all purposes, and
neither the Servicer nor the Trustee, the Paying Agent, the Transfer Agent and
Registrar, nor any agent of any of them, shall be affected by notice to the
contrary except in certain circumstances described in the Agreement.

          THIS CLASS B CERTIFICATE SHALL BE CONSTRUED IN ACCORDANCE WITH THE
LAWS OF THE STATE OF NEW YORK, WITHOUT REFERENCE TO ITS CONFLICT OF LAW
PROVISIONS, AND THE OBLIGATIONS, RIGHTS AND REMEDIES OF THE PARTIES HEREUNDER
SHALL BE DETERMINED IN ACCORDANCE WITH SUCH LAWS.

                                       8
<PAGE>
 
                                  ASSIGNMENT


Social Security or other identifying number of assignee ________________________

          FOR VALUE RECEIVED, the undersigned hereby sells, assigns and
transfers unto _________________________________________________________________
                            (name and address of assignee)

the within certificate and all rights thereunder, and hereby irrevocably
constitutes and appoints ______________________, attorney, to transfer said
certificate on the books kept for registration thereof, with full power of
substitution in the premises.

Dated: _____________________


Signature Guaranteed:

_____________________*


_____________________


(*) NOTE: The signature to this assignment must correspond with the name of the
registered owner as it appears on the face of the within Certificate in every
particular, without alteration, enlargement or any change whatsoever.

                                       6
<PAGE>
 
REGISTERED                                                      $30,000,000  

No. R-B-2                                             CUSIP No. 14040K AN 8

          THIS CLASS B CERTIFICATE HAS NOT BEEN REGISTERED UNDER THE SECURITIES
ACT OF 1933, AS AMENDED (THE "1933 ACT").  NEITHER THIS CLASS B CERTIFICATE NOR
ANY PORTION HEREOF MAY BE OFFERED OR SOLD EXCEPT IN COMPLIANCE WITH THE
REGISTRATION PROVISIONS FOR THE 1933 ACT AND ANY APPLICABLE PROVISIONS OF ANY
STATE BLUE SKY OR SECURITIES LAWS OR PURSUANT TO AN AVAILABLE EXEMPTION FROM
SUCH REGISTRATION PROVISIONS.  THE TRANSFER OF THIS CLASS B CERTIFICATE IS
SUBJECT TO CERTAIN CONDITIONS SET FORTH IN THE POOLING AND SERVICING AGREEMENT
REFERRED TO HEREIN AND TO THE TERMS AND CONDITIONS OF THE PURCHASE AGREEMENT
DATED NOVEMBER 17, 1998.

          THIS CLASS B CERTIFICATE MAY NOT BE ACQUIRED BY OR FOR THE ACCOUNT OF
PERSONS INVESTING ASSETS OF A BENEFIT PLAN OR AN INDIVIDUAL RETIREMENT ACCOUNT
OTHER THAN AN INSURANCE COMPANY GENERAL ACCOUNT.

          Unless this Class B 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.

                           CAPITAL ONE MASTER TRUST

                                 Series 1998-4

                 CLASS B FLOATING RATE ASSET BACKED CERTIFICATE

                         Class B Expected Final Date:
                      The January 2004 Distribution Date

                     Each $1,000 denomination represents a
                          1/60,000 undivided interest
                           in certain assets of the

                           CAPITAL ONE MASTER TRUST
<PAGE>
 
Evidencing an undivided interest in a trust, the corpus of which consists
primarily of receivables generated from time to time in the ordinary course of
business in a portfolio of consumer revolving credit card accounts by CAPITAL
ONE BANK and, in certain circumstances, certain Additional Sellers (as defined
in the Pooling and Servicing Agreement referred to below).

             (Not an interest in or obligation of Capital One Bank,
                any Additional Seller or any affiliate thereof)

          This certifies that CEDE & CO. (the "Class B Certificateholder") is
the registered owner of a fractional undivided interest in certain assets of a
trust (the "Trust") created pursuant to the Pooling and Servicing Agreement
dated as of September 30, 1993 (as amended and supplemented, the "Agreement"),
as supplemented by the Series 1998-4 Supplement dated as of November 17, 1998
(as amended and supplemented, the "Series Supplement"), among Capital One Bank,
as Seller and Servicer, and The Bank of New York, a New York banking
corporation, as trustee (the "Trustee").  The corpus of the Trust consists of
(i) a portfolio of all receivables (the "Receivables") existing in the consumer
revolving credit card accounts and other consumer revolving credit accounts
identified under the Agreement from time to time (the "Accounts"), (ii) all
Receivables generated under the Accounts from time to time thereafter, (iii)
funds collected or to be collected from accountholders in respect of the
Receivables, (iv) all funds which are from time to time on deposit in the
Collection Account and in the Series Accounts, (v) an interest in any Funds
Collateral relating to secured accounts, (vi) the benefits of any Series
Enhancement and (vii) all other assets and interests constituting the Trust.
The Holder of this Class B Certificate is entitled to the benefit of funds on
deposit in a Cash Collateral Account and any Series Enhancement to the extent
provided in the Series Supplement.  Although a summary of certain provisions of
the Agreement and the Series Supplement is set forth below and on the Summary of
Terms and Conditions attached hereto and made a part hereof, this Class B
Certificate does not purport to summarize the Agreement and the Series
Supplement and reference is made to the Agreement and the Series Supplement for
information with respect to the interests, rights, benefits, obligations,
proceeds and duties evidenced hereby and the rights, duties and obligations of
the Trustee.  A copy of the Agreement and the Series Supplement (without
schedules) may be requested from the Trustee by writing to the Trustee at the
Corporate Trust Office.  To the extent not defined herein, the capitalized terms
used herein have the meanings ascribed to them in the Agreement or the Series
Supplement, as applicable.

          This Class B Certificate is issued under and is subject to the terms,
provisions and conditions of the Agreement and the Series Supplement, to which
Agreement and Series Supplement, each as amended and supplemented from time to
time, the Class B Certificateholder by virtue of the acceptance hereof assents
and is bound.

          It is the intent of the Seller and the Investor Certificateholders
that, for federal, state and local income and franchise tax purposes only, the
Investor Certificates will qualify as indebtedness of the Seller secured by the
Receivables.  The Class B Certificateholder, by the acceptance of this Class B
Certificate, agrees to treat this Class B Certificate for federal, state and
local income and franchise tax purposes as indebtedness of the Seller.

          In general, payments of principal with respect to the Class B
Certificates are limited to the Class B Invested Amount, which may be less than
the unpaid principal balance of 

                                       2
<PAGE>
 
the Class B Certificates. The Class B Expected Final Payment Date is the January
2004 Distribution Date, but principal with respect to the Class B Certificates
may be paid earlier or later under certain circumstances described in the
Agreement and the Series Supplement. Principal payments with respect to the
Class B Certificates will not commence until the Class A Invested Amount is paid
in full. In addition, the final payment of principal of the Class B Certificates
will occur later than the Class B Expected Final Payment Date if Collections of
Receivables allocable to pay principal of the Class B Certificates are
insufficient to pay the Class B Invested Amount on or prior to such Distribution
Date.

     No Class B Certificate (or any interest therein) may be acquired or held by
any employee benefit or other plan (including an individual retirement account)
that is subject to the Employee Retirement Income Security Act of 1974, as
amended ("ERISA"), or Section 4975 of the Internal Revenue Code of 1986, as
amended (each, a "Plan"), any trustee or other person acting on behalf of any
Plan, or any other person using "Plan Assets" to effect such acquisition or
holding (each, a "Plan Investor") unless (i) such acquirer or holder is an
insurance company, (ii) the source of funds used to acquire or hold such
Certificate (or interest therein) is an "insurance company general account" (as
defined in U.S. Department of Labor Prohibited Transaction Class Exemption
("PTCE") 95-60), and (iii) the conditions set forth in Sections I and III of
PTCE 95-60 have been satisfied.  By acquiring an interest in this Class B
Certificate, each Class B Certificateholder  or Certificate Owner shall be
deemed to have represented, either (i) that it is not a Plan Investor or (ii)
that (1) it is an insurance company, (2) the source of funds used to acquire or
hold an interest in such Certificate is an "insurance company general account"
(as such term is defined in PTCE 95-60), and (3) the conditions set forth in
Sections I and III of PTCE 95-60 have been satisfied.

          Unless the certificate of authentication hereon has been executed by
or on behalf of the Trustee, by manual signature, this Class B Certificate shall
not be entitled to any benefit under the Agreement or the Series Supplement or
be valid for any purpose.

                                       3
<PAGE>
 
          IN WITNESS WHEREOF, the Seller has caused this Class B Certificate to
be duly executed.


                                    CAPITAL ONE BANK


                                    By: /s/ Charles Kim
                                       ---------------------------------
                                       Name: Charles Kim
                                       Title:   Director of Securitization


Dated: November 17, 1998

                                       4
<PAGE>
 
                    TRUSTEE'S CERTIFICATE OF AUTHENTICATION


          This is one of the Class B Certificates described in the within-
mentioned Agreement and Series Supplement.


                              THE BANK OF NEW YORK,
                               as Trustee


                              By: /s/ Cheryl Laser
                                 --------------------------  
                                 Authorized Officer


                              or


                              By:
                                 --------------------------                   
                                 as Authenticating Agent
                                 for the Trustee


                              By:
                                 --------------------------  
                                 Authorized Officer

                                       5
<PAGE>
 
                           CAPITAL ONE MASTER TRUST

                                 SERIES 1998-4

                CLASS B FLOATING RATE ASSET BACKED CERTIFICATE

                        Summary of Terms and Conditions


          The Receivables consist of Principal Receivables which arise generally
from the purchase of goods and services and amounts advanced to accountholders
as cash advances and Finance Charge Receivables.  This Class B Certificate is
one of a Series of Certificates entitled "Capital One Master Trust, Series 1998-
4."  The Series1998-4 Certificates are being issued in two Classes, the first of
which is known as the "Class A 5.43% Asset Backed Certificates, Series 1998-4"
(the "Class A Certificates") and the second Class is known as the "Class B
Floating Rate Asset Backed Certificates, Series 1998-4" (the  "Class B
Certificates").  In addition, as part of Series 1998-4, the Trust is creating a
third Class of uncertificated interests in the Trust which uncertificated
interests, except as expressly provided in the Series Supplement, are deemed to
be "Investor Certificates" and are known as the "Class C Floating Rate Asset
Backed Interests, Series 1998-4" (the "Class C Interests").  This Class B
Certificate represents a fractional undivided interest in certain assets of the
Trust.  The Trust Assets are allocated in part to the certificateholders of all
outstanding Series (the "Certificateholders' Interest") with the remainder
allocated to the Seller's Interest.  The aggregate interest represented by the
Class B Certificates at any time in the Principal Receivables in the Trust shall
not exceed an amount equal to the Class B Invested Amount at such time.  The
Class B Initial Invested Amount is $60,000,000.  The Class B Invested Amount on
any date will be an amount equal to (a) the Class B Initial Invested Amount,
minus (b) the aggregate amount of principal payments made to the Class B
Certificateholders on or prior to such date, minus (c) the excess, if any, of
the aggregate amount of Class B Investor Charge-Offs for all prior Distribution
Dates over the aggregate amount of any reimbursement of Class B Investor Charge-
Offs for all Distribution Dates preceding such date, minus (d) the amount of
Reallocated Principal Collections allocated on all prior Distribution Dates
pursuant to Section 4.08(a) of the Series Supplement (excluding any Reallocated
Principal Collections that have resulted in a reduction in the Class C Invested
Amount pursuant to Section 4.06(c) of the Series Supplement), minus (e) an
amount equal to the amount by which the Class B Invested Amount has been reduced
on all prior Distribution Dates pursuant to Section 4.06(a) of the Series
Supplement and plus (f) the amount of Excess Spread and Excess Finance Charges
allocated and available on all prior Distribution Dates pursuant to Section
4.07(d) of the Series Supplement for the purpose of reimbursing amounts deducted
pursuant to the foregoing clauses (c), (d) and (e).  Also, a Seller's
Certificate has been issued to Capital One Bank pursuant to the Agreement which
represents the Seller's Interest on the date hereof.

          Subject to the terms and conditions of the Agreement, the Seller may
from time to time direct the Trustee, on behalf of the Trust, to issue one or
more new Series of Investor Certificates, which will represent fractional
undivided interests in certain of the Trust Assets.

                                       6
<PAGE>
 
          On each Payment Date, the Paying Agent shall distribute to each Class
B Certificateholder of record on the last day of the preceding calendar month
(each a "Record Date") such Class B Certificateholder's pro rata share of such
amounts (including amounts on deposit in the Collection Account and the
Principal Funding Account) as are payable to the Class B Certificateholders
pursuant to the Agreement and the Series Supplement.  Distributions with respect
to this Class B Certificate will be made by check mailed to the address of the
Class B Certificateholder of record appearing in the Certificate Register
without the presentation or surrender of this Class B Certificate or the making
of any notation thereon (except for the final distribution in respect of this
Class B Certificate) except that with respect to Class B Certificates registered
in the name of Cede & Co., the nominee for The Depository Trust Company,
distributions will be made in the form of immediately available funds.  Final
payment of this Class B Certificate will be made only upon presentation and
surrender of this Class B Certificate at the office or agency specified in the
notice of final distribution delivered by the Trustee to the Class B
Certificateholders in accordance with the Agreement and the Series Supplement.

          On any day occurring on or after the day on which the Invested Amount
is reduced to 5% or less of the Initial Invested Amount, the Seller has the
option to repurchase the Certificateholders' Interest in the Trust.  The
repurchase price will be equal to (a) if such day is a Distribution Date, the
Reassignment Amount for such Distribution Date or (b) if such day is not a
Distribution Date, the Reassignment Amount for the Distribution Date following
such day.  Following the deposit of the Reassignment Amount in the Collection
Account, the Class A Certificateholders, the Class B Certificateholders and the
Class C Interest Holders will not have any interest in the Receivables and the
Class B Certificates will represent only the right to receive such Reassignment
Amount.

          This Class B Certificate does not represent an obligation of, or an
interest in, the Seller, the Servicer or any affiliate of any of them and is not
insured or guaranteed by the Federal Deposit Insurance Corporation or any other
governmental agency or instrumentality.  This Class B Certificate is limited in
right of payment to certain Collections with respect to the Receivables (and
certain other amounts), all as more specifically set forth hereinabove and in
the Agreement and the Series Supplement.

          The Agreement or any Supplement may, subject to certain conditions, be
amended by the Seller, the Servicer and the Trustee without Certificateholder
consent. The Trustee may, but shall not be obligated to, enter into any such
amendment which affects the Trustee's rights, duties or immunities under the
Agreement or otherwise.

          The Agreement or any Supplement may also be amended from time to time
by the Servicer, the Seller and the Trustee, with the consent of the Holders of
Investor Certificates evidencing not less than 66-2/3% of the aggregate unpaid
principal amount of the Investor Certificates of all adversely affected Series,
for the purpose of adding any provisions to or changing in any manner or
eliminating any of the provisions of the Agreement or any Supplement or of
modifying in any manner the rights of the Investor Certificateholders; provided,
                                                                       -------- 
however, that no such amendment shall (i) reduce in any manner the amount of or
- -------                                                                        
delay the timing of any distributions to be made to Investor Certificateholders
or deposits of amounts to be so distributed or the amount available under any
Series Enhancement without the consent of each affected Investor
Certificateholder, (ii) change the definition of or the manner of 

                                       7
<PAGE>
 
calculating the interest of any Investor Certificateholder without the consent
of each affected Investor Certificateholder, (iii) reduce the aforesaid
percentage required to consent to any such amendment without the consent of each
Investor Certificateholder or (iv) adversely affect the rating of any Series or
Class by each Rating Agency without the consent of the Holders of Investor
Certificates of such Series or Class evidencing not less than 66-2/3% of the
aggregate unpaid principal amount of the Investor Certificates of such Series or
Class. The Trustee may, but shall not be obligated to, enter into any such
amendment which affects the Trustee's rights, duties or immunities under the
Agreement or otherwise.

          The Class B Certificates are issuable in minimum denominations of
$1,000 and integral multiples of $1,000.  The transfer of this Class B
Certificate shall be registered in the Certificate Register upon surrender of
this Class B Certificate for registration of transfer at any office or agency
maintained by the Transfer Agent and Registrar accompanied by a written
instrument of transfer, in a form satisfactory to the Trustee or the Transfer
Agent and Registrar, duly executed by the Class B Certificateholder or such
Class B Certificateholder's attorney, and duly authorized in writing with such
signature guaranteed, and thereupon one or more new Class B Certificates of
authorized denominations and for the same aggregate fractional undivided
interest will be issued to the designated transferee or transferees.

          As provided in the Agreement and subject to certain limitations
therein set forth, Class B Certificates are exchangeable for new Class B
Certificates evidencing like aggregate fractional undivided interests as
requested by the Class B Certificateholder surrendering such Class B
Certificates.  No service charge may be imposed for any such exchange but the
Servicer or Transfer Agent and Registrar may require payment of a sum sufficient
to cover any tax or other governmental charge that may be imposed in connection
therewith.

          The Servicer, the Trustee, the Paying Agent and the Transfer Agent and
Registrar and any agent of any of them, may treat the person in whose name this
Class B Certificate is registered as the owner hereof for all purposes, and
neither the Servicer nor the Trustee, the Paying Agent, the Transfer Agent and
Registrar, nor any agent of any of them, shall be affected by notice to the
contrary except in certain circumstances described in the Agreement.

          THIS CLASS B CERTIFICATE SHALL BE CONSTRUED IN ACCORDANCE WITH THE
LAWS OF THE STATE OF NEW YORK, WITHOUT REFERENCE TO ITS CONFLICT OF LAW
PROVISIONS, AND THE OBLIGATIONS, RIGHTS AND REMEDIES OF THE PARTIES HEREUNDER
SHALL BE DETERMINED IN ACCORDANCE WITH SUCH LAWS.

                                       8
<PAGE>
 
                                  ASSIGNMENT


Social Security or other identifying number of assignee ________________________

          FOR VALUE RECEIVED, the undersigned hereby sells, assigns and
transfers unto _________________________________________________________________
                            (name and address of assignee)

the within certificate and all rights thereunder, and hereby irrevocably
constitutes and appoints ______________________, attorney, to transfer said
certificate on the books kept for registration thereof, with full power of
substitution in the premises.

Dated: _____________________


Signature Guaranteed:

_____________________*


_____________________


(*) NOTE: The signature to this assignment must correspond with the name of the
registered owner as it appears on the face of the within Certificate in every
particular, without alteration, enlargement or any change whatsoever.

                                       6


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