Year   Starting Serial Number   Ending Serial Number
1934   100 -- 325
1935   326 -- 1000
1936   1001 -- 1985
1937   1986 -- 3024
1938   3025 -- 3875
1939   3876 -- 4244
1940   4245 -- 4784
1941   4785 -- 5255
1942   5256 -- 5593
1943   5594 -- 5709
1944   5710 -- 6160
1945   6161 -- 6448
1946   6449 -- 6946
1947   6947 -- 7474
1948   7475 -- 8244
1949   8245 -- 8394
1950   8395 -- 8544
1951   8545 -- 8626
1952   8627 -- 8707
1953   8708 -- 8716
1954   8717 -- 8720
 

   

      This is a list of serial numbers for all models of the Plymouth and Silver King  tractors made in Plymouth Ohio. The Plymouth tractor being built first, starting at number 100 and ending at 314.  Then  Silver King began production with number 315  . The last tractor built in Plymouth, Ohio was built in February 1954

 

 

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The first tractors built were prototypes. It is unknown if they had serial numbers

Serial No.        Nature of change starting with this Number

100                  This is supposed to be the first Plymouth Built in Nov. 1933

 

315                  Name of the Tractor was changed from Plymouth to Silver King

326                  Start of the 1935 Production

918                  Crankcase capacity changed , it was 2 1/2 quarts. Now 3 wheel models 

                           from 918 to 3380 hold 3 1/2 qts.

1001                Start of the 1936 Production

1801                Heavier and improved rear end construction 

1986                Start of the 1937 Production

3025                Start of the 1938 Production

3380-4320      3 wheel models now hold 5 qts. oil

3876                Start of the 1939 Production

4245                Start of the 1940 Production

4300                Double acting, toggle link actuated brake installed

4320                Model 38 & 44 Changed, continental F-162 used on 4 wheelers

4320-42 series   3 wheel models with pressed steel oil pans hold 4 qts. models with

                           cast oil pan hold 5 1/2 qts. same as the 42 series 

4341-5319      IXB-3 Hercules engine now used in small 4 wheelers

4785               Start of the 1941 Production

5013                Except for 5034,5035, all models were fitted with the final drive gear and

                          wheel hub installed on the 42 series.

5223                A cam and follower substituted for toggle linkage on brakes of 3

                            wheelers

5256                Start of the 1942 Production

5594                Start of the 1943 Production

5710                Start of the 1944 Production

6161                Start of the 1945 Production

6449                Start of the 1946Production

6947                Start of the 1947 Production

7475                Start of the 1948 Production

8245                Start of the 1949 Production

8395                Start of the 1950 Production

8545                Start of the 1951 Production

8627                Start of the 1952 Production

8708                Start of the 1953 Production

8717                Start of the 1954 Production

8720                The last Silver King is Built

 

50000             The Mountain State Tractor Company (Clarksburg, West Virginia) takes

                         over all Silver King assembly; they call it the "Mountain State" tractor

 

50075             The last Mountain State rolls off the assembly line and parts are sent 

                           back to Fate-Root-Heath in Plymouth, Ohio

 

 

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