EXECUTION VERSION



                                September 6, 2005

National Penn Bancshares, Inc.
Philadelphia and Reading Avenues
Boyertown, Pennsylvania 19512

Ladies and Gentlemen:

     National Penn Bancshares,  Inc. ("NPB") and Nittany Financial Corp. ("NFC")
are  considering  entering into a Merger  Agreement dated September 6, 2005 (the
"Agreement").

     Pursuant to the proposed Agreement, and subject to the terms and conditions
set forth therein: (a) NPB will acquire NFC by a merger of NFC with and into
NPB; (the "Merger") (b) shareholders of NFC will receive shares of NPB common
stock and/or cash in exchange for their shares of NFC common stock owned on the
closing date; and (c) holders of NFC options will receive stock options
exercisable for common stock of NPB in exchange for options exercisable for
common stock of NFC outstanding on the closing date (the foregoing,
collectively, the "Transactions").

     I have been advised that I may be deemed to be an "affiliate" of NFC for
purposes of certain rules issued by the Securities and Exchange Commission (the
"SEC") under the Securities Act of 1933.

     I understand that NPB is requiring, as a condition to its execution and
delivery to NFC of the Agreement, that I execute and deliver to NPB this Letter
Agreement.

     Intending to be legally bound hereby, I irrevocably  agree and represent as
follows:

     1. I agree to vote or cause to be voted for  approval  of the  Transactions
all shares of NFC common  stock  over  which I  exercise  sole or shared  voting
power, excluding any such shares that I am acting over as a fiduciary other than
those which are held in IRAs for my benefit.

     2. Through the earlier of (a) the receipt of the requisite  approval of the
Transactions by the  shareholders of NFC or (b) the termination of the Agreement
pursuant  to  Article  VII  thereof,  I agree not to offer,  sell,  transfer  or
otherwise  dispose  of,  or  to  permit  the  offer,  sale,  transfer  or  other
disposition  of, any shares of NFC  common  stock over which I exercise  sole or
shared  voting power or any options that I hold to acquire  shares of NFC common
stock;  provided,  however,  that I may make a bona fide gift of shares prior to
that date as long as the  recipient  agrees to vote such shares for  approval of
the

National Penn Bancshares, Inc.
September 6, 2005
Page 2

Transactions and agrees,  in writing,  to be bound by all the terms hereof as if
an original signatory hereto.

     3. I agree,  if I am an  optionholder,  to  exchange  my options to acquire
shares of common  stock of NFC for  options to acquire  such number of shares of
common stock of NPB,  and at such per share  exercise  price,  as is provided in
Section 2.08 of the Agreement, and otherwise on the same terms and conditions as
the exchanged NFC options (unless I shall have exercised, with the prior written
consent of NPB, any such option prior to the Transactions).

     4. I have  sole or shared  voting  power  over the  number of shares of NFC
common  stock,  and hold  stock  options  for the number of shares of NFC common
stock,  if any, set forth below opposite my signature  line. NPB recognizes that
with  respect to any such shares which have been pledged to a third party (which
are specifically  identified below), I will not be able to control the voting or
disposition of such shares in the event of a default.

     5. I agree, if I am an optionholder, not to exercise any options to acquire
shares of NFC common stock prior to the closing of the Transactions  without the
prior written consent of NPB.

     6. I  hereby  waive  the  right  to  assert  dissenters  rights  under  the
Pennsylvania  Business  Corporation  Law of  1988,  as  amended,  and any  other
applicable law or regulation.

     7. I agree not to offer, sell,  transfer or otherwise dispose of any shares
of NPB common stock received pursuant to the Transactions, except:

     (a) at such time as a  registration  statement  under the Securities Act of
1933, as amended ("Securities Act"),  covering sales of such NPB common stock is
effective and a prospectus is made available under the Securities Act;

     (b) within the limits, and in accordance with the applicable provisions of,
Rule 145  under  the  Securities  Act  ("Rule  145") or upon  expiration  of all
restrictions set forth in Rule 145 applicable to me; or

     (c) in a transaction which, in an opinion of counsel satisfactory to NPB or
as described in a "no-action" or interpretive  letter from the staff of the SEC,
is not required to be registered under the Securities Act;

and I acknowledge and agree that NPB is under no obligation to register the
sale, transfer or other disposition of NPB common stock by me or on my behalf,
or to take any other action necessary to make an exemption from registration
available.

National Penn Bancshares, Inc.
September 6, 2005
Page 3

     8. NPB shall take all steps  necessary to ensure that NPB is in  compliance
with all those  requirements of Rule 145 and Rule 144 with which NPB must comply
in order for the resale  provisions  of Rule  145(d) to be  available  to me. In
addition,  NPB shall cause its Director of SEC Compliance  (in his/her  absence,
outside-counsel  selected by NPB) to respond promptly to any requests from NPB's
transfer  agent for the  issuance  of an opinion  that any  transfer  by me that
complies  with the  requirements  of Rule 145 and 144 may be made  provided such
counsel receives customary  representation letters and all other information and
documentation reasonably required by NPB from me.

     9. I agree that neither NFC nor NPB shall be bound by any attempted sale of
any shares of NFC common stock or NPB common stock, respectively,  and NFC's and
NPB's transfer agents shall be given  appropriate stop transfer orders and shall
not be required to register any such  attempted  sale,  unless the sale has been
effected in compliance  with the terms of this Letter  Agreement;  and I further
agree that (a) any certificate  representing shares of NPB common stock received
by me  pursuant  to  the  Merger  may be  endorsed  with  a  restrictive  legend
consistent  with the terms of this Letter  Agreement;  and (b) any shares of NPB
common  stock  received by me  pursuant to the Merger in the form of  book-entry
shares may be subject to a stop order  consistent  with the terms of this Letter
Agreement.  I understand that upon expiration of the  restrictions  set forth in
Rule 145 and applicable to me, upon my request,  NPB shall cause its Director of
SEC Compliance (in his/her absence, outside-counsel selected by NPB) to promptly
issue an opinion to the transfer agent or provide other documentation reasonably
acceptable  to the transfer  agent so as to cause such stop orders to be lifted.
If at any point in time I hold  certificates  representing  shares of NPB common
stock  received  by me in the Merger and such  certificates  bear a  restrictive
legend, upon expiration of the restrictions set forth in Rule 145 and applicable
to me, upon my  request,  NPB shall cause its  Director  of SEC  Compliance  (in
his/her absence,  outside-counsel  selected by NPB) to promptly issue an opinion
to the transfer agent or provide other  documentation  reasonably  acceptable to
the transfer agent so as to cause such  certificates to be reissued without such
restrictive legend.

     10. I represent  that I have no present plan or  intention to offer,  sell,
exchange,  or otherwise dispose of any shares of NPB common stock to be received
in the Transactions.

     11.  I  represent  that I have  the  capacity  to enter  into  this  Letter
Agreement and that it is a valid and binding obligation  enforceable  against me
in accordance with its terms,  subject to bankruptcy,  insolvency and other laws
affecting creditors' rights and general equitable principles.

National Penn Bancshares, Inc.
September 6, 2005
Page 4

     I am signing this Letter  Agreement in my capacity as a shareholder of NFC,
and as an  optionholder if I am an  optionholder,  and not in any other capacity
(including as a director).

         This Letter Agreement shall be effective upon acceptance by NPB.


[THE REMAINDER OF THIS PAGE IS INTENTIONALLY LEFT BLANK]



National Penn Bancshares, Inc.
September 6, 2005
Page 5



     This Letter Agreement shall terminate  concurrently with, and automatically
upon, any termination of the Agreement in accordance with its terms, except that
any such termination  shall be without  prejudice to NPB's rights arising out of
any willful breach of any covenant or representation contained herein.

                                           Very truly yours,

Number of shares held:
 Sole voting power:            ________
 Shared voting power:          ________

Number of shares subject
 to stock options:             ________

Number of pledged
 shares:                       ________


_____________________________________                ___________________________
Witness:                                             [Name]



Accepted:
- ---------

NATIONAL PENN BANCSHARES, INC.


By: ___________________________
    Name:
    Title: