Each machine received a serial number. The overview is provided here:
| Year | Month | Serial | |||||
| 1913 | March | 1 | |||||
| 1914 | January | 371 | |||||
| 1915 | January | 894 | |||||
| 1916 | January | 937 | |||||
| 1917 | January | 1422 | |||||
| 1918 | January | 1870 | |||||
| 1919 | January | 2317 | |||||
| 1920 | January | 3014 | |||||
| 1921 | January | 3816 | |||||
| 1922 | January | 4323 | |||||
| 1923 | January | 5203 | |||||
| 1924 | January | 6109 | |||||
| 1925 | January | 6772 | |||||
| 1926 | January | 7521 | |||||
| 1927 | January | 8300 | |||||
| 1928 | January | 9021 | |||||
| 1929 | January | 9645 | |||||
| 1930 | January | 10419 | |||||
| 1931 | January | 10964 | |||||
| 1932 | January | 11711 | |||||
| 1933 | January | 12030 | |||||
| 1934 | January | 12339 | |||||
| 1935 | January | 13048 | |||||
| 1936 | January | 13398 | |||||
| 1937 | January | 14010 | |||||
| 1938 | January | 15008 | |||||
| 1939 | January | 15716 | |||||
| 1940 | January | 16220 | |||||
| 1941 | January | 16592 | |||||
| 1942 | January | 16835 | |||||
| 1943 | January | 16992 | |||||
| 1944 | January | 17085 | |||||
| 1945 | January | 17242 | |||||
| 1946 | January | 17400 | |||||
| 1947 | January | 17725 | |||||
| 1948 | January | 18500 | |||||
| 1949 | January | 19450 | |||||
| 1950 | January | 20350 | |||||
| 1951 | January | 21250 | |||||
| 1952 | January | 22250 | |||||
| 1953 | January | 22850 | |||||
| 1954 | January | 23750 | |||||
| 1955 | January | 24610 | |||||
| 1956 | January | 25500 | |||||
| 1957 | January | 26650 | |||||
| 1958 | January | 27200 | |||||
| 1959 | January | 28203 | |||||
| 1960 | January | 28623 | |||||
| 1961 | January | 30025 | |||||
| 1962 | January | 30482 | |||||
| 1963 | January | 32023 | |||||
| 1964 | January | 32491 | |||||
| 1965 | January | 32905 | |||||
| 1966 | January | 33376 | |||||
| 1967 | January | 33900 | |||||
| 1968 | January |
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