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

                          SCHEDULE 13G
            Under the Securities Exchange Act of 1934
                  (Amendment No. ___________)*


                          SPARTON CORP.
                        (Name of Issuer)

                             Common
                 (Title of Class of Securities)

                            847235108
                         (CUSIP Number)

                        December 31, 2003
     (Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which
this Schedule is filed:
[X ] Rule 13d-1(b)
[  ] Rule 13d-1(c)
[  ] Rule 13d-1(d)

*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 the disclosures provided
in a prior cover page.

The information required in the remainder 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).

CUSIP No.     847235108

  1. Names of Reporting Persons.
      I.R.S. Identification Nos. of above persons (entities
      only).
           Donald Smith & Co., Inc.
              13-2807845

  2. Check the Appropriate Box if a Member of a Group (See
  Instructions)

      (a)
      (b)  [X]


 3.  SEC Use Only
...............................................................

 4.  Citizenship or Place of Organization
             A Delaware Corporation

Number of          5.  Sole Voting Power      222,531 shares
Shares
Beneficially       6.  Shared Voting Power       0
Owned by
Each Reporting         7.    Sole Dispositive Power  222,531
shares
Person With
                    8.   Shared Dispositive Power   0


 9.Aggregate Amount Beneficially Owned by Each Reporting Person
       222,531 shares


 10. Check if the Aggregate Amount in Row (9) Excludes Certain
 Shares (See Instructions)

 11. Percent of Class Represented by Amount in Row (9)  Less
 than 5%
 12. Type of Reporting Person (See Instructions)       IA


Item 1.

     (a)  Name of Issuer:  Sparton Corp.
     (b)  Address of Issuer's Principal Executive Offices
               2400 E. Ganson St.
               Jackson, Michigan 49202

Item 2.

    (a)  Name of Person Filing:  Donald Smith & Co., Inc.

     (b)  Address of Principal Business Office:
          East 80 Route 4 p Suite 360
    Paramus, NJ 07652

    (c)  Citizenship:    A Delaware Corporation

    (d)  Title of Class of Securities: Common

     (e)  CUSIP Number: 847235108

Item 3.  This statement is filed pursuant to Section 240.13d-
          1(b), and the person filing is an investment advisor
          registered in accordance with Section 240.13d-
          1(b)(1)(ii)(E);

Item 4.   Ownership.
Provide the following information regarding the aggregate number
and percentage of the class of securities of the issuer
identified in Item 1.

    (a)  Amount beneficially owned:  SEE ITEM 9 OF COVER PAGE

    (b)  Percent of class:        SEE ITEM 11 OF COVER PAGE

    (c)  Number of shares as to which the person has:
        (i)    SOLE POWER TO VOTE:      SEE ITEM 5 OF COVER PAGE
        (ii)   SHARED POWER TO VOTE:    SEE ITEM 6 OF COVER PAGE
        (iii)  SOLE POWER TO DISPOSE:   SEE ITEM 7 OF COVER PAGE
        (iv)   SHARED POWER TO DISPOSE: SEE ITEM 8 OF COVER PAGE

Item 5. Ownership of Five Percent or Less of a Class
        If this statement is being filed to report the fact that
        as of the date hereof the reporting person has ceased to
        be the beneficial owner of more than five percent of the
        class of securities, check the following    [XX].

Item 6. Ownership of More than Five Percent on Behalf of Another
Person:
                NOT APPLICABLE.

Item 7. Identification and Classification of the Subsidiary
         Which Acquired the Security Being Reported on By the
         Parent Holding Company
                NOT APPLICABLE

Item 8. Identification and Classification of Members of the
Group
                NOT APPLICABLE

Item 9. Notice of Dissolution of Group
                NOT APPLICABLE

Item 10.Certification

     (a)
       By signing below I certify that, to the best of my
       knowledge and belief, the securities referred to above
       were acquired and are held in the ordinary course of
       business and were not acquired and are not held for the
       purpose of or with the effect of changing or influencing
       the control of the issuer of the securities and were not
       acquired and are not held in connection with or as a
       participant in any transaction having that purpose or
       effect.


                            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.

January 21, 2004__________
Date

Donald G. Smith___________
Signature

President_________________
Title