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IBM / International Time Recording Co. Clock Serial Numbers

DATE SERIAL #
1917 55001-145000
1918 145001-167000
1919 167001-193000
1920 193001-219000
1921 219001-228000
1922 228001-240000
1923 240001-2650000
1924 265001-285000
1925 285001-305000
1926 305001-325000
1927 325001-345000
1928 345001-365000
1929 365001-395000
1930 395001-415000
1931 415001-435000
1932 435001-445000
1933 445001-462000
1934 462001-475000
1935 475001-490000
1936 490001-512000
1937 512001-536000
1938 536001-556000
1939 556001-585000
1940 585001-608000
1941 608001-649000
1942 649001-685000
1943 685001-713000
1944 713001-734000
1945 734001-767000
1946 767001-825000
1947 825001-884000
1948 884001-935000
1949 935001-999999
1950 10000*-90000
1951 90001-164000
1952 164001-251000
1953 251001-344000
1954 344001-440000
1955 440001-535000
1956 535001-610000

Serial numbers are generally located on the movement of the timepiece.  Serial numbers are approximate. *Serial numbers start over in 1950.

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