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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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