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

                                  SCHEDULE 13D

                    Under the Securities Exchange Act of 1934
                               (Amendment No. 3 )*

                          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)

                                December 03, 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                17,010 Shares of Common stock
BENEFICIALLY      8  SHARED VOTING POWER
OWNED BY              11,058 Shares of Common stock
EACH              9  SOLE DISPOSITIVE POWER
REPORTING             17,010 Shares of Common stock
PERSON WITH       10  SHARED DISPOSITIVE POWER
                      11,058 Shares of Common stock

11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

          28,068 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)
         0.74%

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                288,318 Shares of Common stock
BENEFICIALLY      8  SHARED VOTING POWER
OWNED BY                       -----
EACH              9  SOLE DISPOSITIVE POWER
REPORTING             288,318 Shares of Common stock
PERSON WITH       10 SHARED DISPOSITIVE POWER
                                  -----

11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
            288,318 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)
           7.67%

                          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                23,814 Shares of Common stock
BENEFICIALLY      8  SHARED VOTING POWER
OWNED BY                   --------
EACH              9  SOLE DISPOSITIVE POWER
REPORTING            23,814 Shares of Common stock
PERSON WITH       10  SHARED DISPOSITIVE POWER
                               -------

11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

          23,814 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)
         0.63%

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.
------   -----------------------

                                   No change.


Item 3.   Source and Amount of Funds or Other Compensation.
------    ------------------------------------------------

                                   No change.


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

                                   No change.


Item 5.  Interest in Securities of the Issuer.
------   ------------------------------------
(a) The persons reporting hereby owned the following shares of
Common Stock as of December 03, 2003.

                                    Shares of Common Stock

Loeb Arbitrage Fund                     288,318
Loeb Partners Corporation*               28,068
Loeb Offshore Fund                       23,814
                                    -----------
                                        340,200


The total shares of Common Stock constitute 9.05% the 3,758,000 outstanding
shares of Common Stock as reported by the issuer.

-------------------------
*Including 11,058 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
                              11-17-03       2063               4.64
                              11-18-03       2888               4.65
                              11-19-03       1650               4.62
                              11-25-03       1650               4.75
                              11-26-03         16               4.75
                               12-1-03       1650               4.76
                               12-2-03        825               4.76
                               12-3-03        825               4.79

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
                              11-17-03      21187              4.641
                              11-18-03      29662              4.655
                              11-19-03      16950              4.618
                              11-25-03      16950              4.745
                              11-26-03        170              4.748
                               12-1-03      16950              4.763
                               12-2-03       8475              4.757
                               12-3-03       8475              4.787

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
                              11-17-03       1750               4.64
                              11-18-03       2450               4.65
                              11-19-03       1400               4.62
                              11-25-03       1400               4.75
                              11-26-03         14               4.75
                               12-1-03       1400               4.76
                               12-2-03        700               4.76
                               12-3-03        700               4.79

--------------------
*Including 11,058 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.

December 04, 2003                                Loeb Partners Corporation



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


December 04, 2003                                Loeb Arbitrage Fund
                                                 By: Loeb Arbitrage Management
                                                     , Inc.



                                                 By: /s/ Gideon J. King
                                                 President


December 04, 2003                                Loeb Offshore Fund



                                                  By: /s/ Gideon J. King
                                                  Director