UNITED STATES
                        SECURITIES & EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13D

                    Under the Securities Exchange Act of 1934
                              (Amendment No.___ )*

                          Medstone International, Inc.
                                (Name of Issuer)

                                  Common Stock
                         (Title of Class of Securities)

                                    58505C101
                                 (CUSIP Number)

                                    Bruce Lev
                          c/o Loeb Partners Corporation
                  61 Broadway, N.Y., N.Y., 10006 (212) 483-7017
                    (Name, address and Telephone Number of Person Authorized
                        to Receive Notices and Communications)

                                November 14, 2003
             (Date of Event which Requires Filing of this Statement)

If the filing person has previously  filed a statement on Schedule 13G to report
the  acquisition  which is the subject of this  Schedule 13D, and is filing this
schedule  because of Rule 13d-1(b)(3) or (4), check the following box [ ]. Check
the  following  box if a fee is being  paid  with  statement  [ ]. (A fee is not
required only if the following reporting person: (1) has a previous statement on
file  reporting  beneficial  ownership of more than five percent of the class of
securities  described  is Item 1;  and (2) has  filed  no  amendment  subsequent
thereto reporting  beneficial  ownership of five percent or less of such class.)
(See Rule 13d-7.) Note:  Six copies of this  statement,  including all exhibits,
should be filed with the Commission. See Rule 13d-1(a) for other parties to whom
copies are to be sent. *The remainder of this cover page shall be filled out for
a reporting  person's  initial  filing on this form with  respect to the subject
class of securities,  and for any subsequent  amendment  containing  information
which would alter  disclosures  provided in a prior cover page. The  information
required  on the  remained  of this cover page shall not be deemed to be "filed"
for the purpose of Section 18 of the Securities  Exchange Act of 1934 ("Act") or
otherwise  subject to the  liabilities  of that  section of the Act but shall be
subject to all other provisions of the Act (however, see the Notes).




                                  SCHEDULE 13D

CUSIP NO. 58505C101

1  NAME OF REPORTING PERSON
    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

          Loeb Partners Corporation

2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*          (a) [X]

                                                              (b) [ ]
3  SEC USE ONLY
4  SOURCE OF FUNDS*

         WC, O

5  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED     [    ]
    PURSUANT TO ITEMS 2(d) or 2(e)

6  CITIZENSHIP OR PLACE OF ORGANIZATION
         Delaware

NUMBER OF         7  SOLE VOTING POWER
SHARES               10,000 Shares of Common stock
BENEFICIALLY      8  SHARED VOTING POWER
OWNED BY              6,501 Shares of Common stock
EACH              9  SOLE DISPOSITIVE POWER
REPORTING            10,000 Shares of Common stock
PERSON WITH      10  SHARED DISPOSITIVE POWER
                      6,501 Shares of Common stock

11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

          16,501 Shares of Common stock

12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN  SHARES*

13  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
         0.44%

14 TYPE OF REPORTING PERSON*
         PN, BD, IA


                                  SCHEDULE 13D
CUSIP NO. 58505C101

1  NAME OF REPORTING PERSON
   S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

          Loeb Arbitrage Fund

2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*          (a) [X]

                                                              (b) [ ]
3  SEC USE ONLY

4  SOURCE OF FUNDS

         WC, O

5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDING IS REQUIRED            [  ]
     PURSUANT TO ITEMS 2(d) or 2(e)

6  CITIZENSHIP OR PLACE OF ORGANIZATION

         New York

NUMBER OF         7  SOLE VOTING POWER
SHARES               169,499 Shares of Common stock
BENEFICIALLY      8  SHARED VOTING POWER
OWNED BY                -----
EACH              9  SOLE DISPOSITIVE POWER
REPORTING            169,499 Shares of Common stock
PERSON WITH      10  SHARED DISPOSITIVE POWER
                         -----

11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
            169,499 Shares of Common stock

12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*

13  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
           4.51%

14 TYPE OF REPORTING PERSON*
           PN, BD


                                  SCHEDULE 13D

CUSIP NO. 58505C101

1  NAME OF REPORTING PERSON
    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

          Loeb Offshore Fund, Ltd.

2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*          (a) [X]

                                                              (b) [ ]
3  SEC USE ONLY

4  SOURCE OF FUNDS*

         WC, O

5  CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED     [    ]
    PURSUANT TO ITEMS 2(d) or 2(e)

6  CITIZENSHIP OR PLACE OF ORGANIZATION
         Cayman Islands

NUMBER OF         7  SOLE VOTING POWER
SHARES               14,000 Shares of Common stock
BENEFICIALLY      8  SHARED VOTING POWER
OWNED BY                 --------
EACH              9  SOLE DISPOSITIVE POWER
REPORTING            14,000 Shares of Common stock
PERSON WITH      10  SHARED DISPOSITIVE POWER
                          -------

11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

          14,000 Shares of Common stock

12  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN  SHARES*

13  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
         0.37%

14 TYPE OF REPORTING PERSON*
         CO

Item 1.  Security and Issuer.
------   -------------------

This statement refers to the Common Stock of Medstone  International,  Inc., 100
Columbia, Suite 100, Aliso Viejo, CA., 92656.

Item 2.  Identity and Background.
------   -----------------------

Loeb Arbitrage Fund ("LAF"),  61 Broadway,  New York, New York,  10006, is a New
York limited partnership. It is a registered broker/dealer.  Its general partner
is Loeb Arbitrage Management,  Inc., ("LAM"), a Delaware  corporation,  with the
same  address.  Its President is Gideon J. King.  The other  officers of LAM are
Thomas L. Kempner, Chairman of the Board, President, Peter A. Tcherepnine,  Vice
President,  Edward  J.  Campbell,  Vice  President.  Loeb  Partners  Corporation
("LPC"), 61 Broadway,  New York, New York, 10006, is a Delaware corporation.  It
is a registered  broker/dealer and a registered  investment  adviser.  Thomas L.
Kempner is its President and a director and its Chief Executive Officer.  Norman
N. Mintz is a Vice  President  and also a director.  Gideon J. King is Executive
Vice President.  Loeb Holding Corporation  ("LHC"), a Maryland  corporation,  61
Broadway,  New York,  New York,  10006 is the sole  stockholder  of LAM and LPC.
Thomas L. Kempner is its President and a director as well as its Chief Executive
Officer and majority stockholder.  Edward E. Matthews, Norman N. Mintz and Peter
A. Tcherepnine are also directors.  Mr. Matthews' address is 70 Pine Street, New
York,  New York 10270.  Loeb Offshore  Fund,  Ltd.,  ("LOF") is a Cayman Islands
exempted company.  Loeb Offshore  Management,  LLC ("LOM") is a Delaware limited
liability company,  a registered  investment adviser and is wholly owned by Loeb
Holding  Corporation.  It is the investment  adviser of LOF.  Gideon J. King and
Thomas L. Kempner are Directors of LOF and Managers of LOM. The business address
of all individuals  other than Mr. Matthews is 61 Broadway,  New York, New York,
10006. All of the individuals named are United States citizens.  None have been,
within  the last five  years,  convicted  in a  criminal  proceeding  (excluding
traffic  violations  or  similar  misdemeanors)  or  been  a  party  to a  civil
proceeding of a judicial or administrative body of competent jurisdiction and as
a result of such proceeding  been or are subject to a judgment,  decree or final
order  enjoining  future  violations of, or prohibiting or mandating  activities
subject to,  federal or state  securities  laws or finding any  violations  with
respect to such laws.

Item 3.   Source and Amount of Funds or Other Compensation.
------    ------------------------------------------------
Shares of Common  Stock were  acquired  by LAF,  LPC and LOF in margin  accounts
maintained with Bear Stearns Securities Corp.

Item 4.   Purpose of Transaction.
------    ----------------------

LAF, LPC and LOF have acquired  shares of Common Stock for investment  purposes.
LAF,  LPC and LOF reserve the right to sell shares of Common Stock or to acquire
additional shares in open market transactions or otherwise.


Item 5.  Interest in Securities of the Issuer.
------   ------------------------------------

(a) The persons reporting hereby owned the following shares of
Common Stock as of November 14, 2003.

                                 Shares of Common Stock

Loeb Arbitrage Fund                     169,499
Loeb Partners Corporation*               16,501
Loeb Offshore Fund                       14,000
                                    -----------
                                        200,000

The total shares of Common Stock constitute 5.32% the 3,758,000 outstanding
shares of Common Stock as reported by the issuer.
-------------------------
*Including 6,501 shares of Common Stock purchased for the account of one
customer of Loeb Partners Corporation as to which it has investment discretion.

(b) See paragraph (a) above.

(c) The following purchases of Common Stock have been made in the last sixty
(60) days by the following:

                                   Purchases of Common Stock

Holder                            Date     Shares      Average Price
Loeb Partners Corp.*          11-12-03       6188              $4.78
                              11-13-03       4125               4.63
                              11-14-03       6188               4.62


Holder                                     Shares      Average Price
Loeb Arbitrage Fund           11-12-03      63562             $4.781
                              11-13-03      42375              4.633
                              11-14-03      62562              4.618


Holder                                     Shares      Average Price
Loeb Offshore Fund            11-12-03       5250              $4.78
                              11-13-03       3500               4.63
                              11-14-03       5250               4.62

--------------------
*Including 6,501 shares of Common Stock purchased for the account of one
customer of Loeb Partners Corporation as to which it has investment discretion.

All reported transactions were effected on Nasdaq.

(d) Not applicable.

(e). Not applicable.

Item 6.Contracts, Arrangements, Understandings or Relationships with Respect to
       the Issuer.

                  None.

Item 7.  Materials to be Filed as Exhibits.

                  None.
Signature

After  reasonable  inquiry and to the best of my knowledge and belief,I certify
that the information set forth in this statement is true, complete and correct.

November 18 2003                    Loeb Partners Corporation


                                By: /s/ Gideon J. King
                                    Executive Vice President


November 18, 2003                   Loeb Arbitrage Fund
                                By: Loeb Arbitrage Management, Inc.


                                By: /s/ Gideon J. King
                                    President

November 18, 2003                   Loeb Offshore Fund



                                By: /s/ Gideon J. King
                                    Director