Machine Serial Numbers: Two Letter Prefix
| Machine Serial No. |
Year of Issue |
| AA-000.001 to AA-188.650 |
1924 |
| AA-188.651 to AA-817.510 |
1925 |
| AA-817.511 to AA-999.999 |
1926 |
| AB-000.001 to AB-424.850 |
1926 |
| AB-424.851 to AB-970.425 |
1927 |
| AB-970.426 to AB-999.999 |
1928 |
| AC-000.001 to AC-455.380 |
1928 |
| AC-455.381 to AC-907.690 |
1929 |
| AC-907.691 to AC-999.999 |
1930 |
| AD-000.001 to AD-305.595 |
1930 |
| AD-305.596 to AD-442.270 |
1931 |
| AD-442.271 to AD-489.945 |
1932 |
| AD-489.946 to AD-573.295 |
1933 |
| AD-573.296 to AD-826.955 |
1934 |
| AD-826.956 to AD-999.999 |
1935 |
| AE-000.001 to AE-064.365 |
1935 |
| AE-064.366 to AE-365.140 |
1936 |
| AE-365.141 to AE-791.090 |
1937 |
| AE-791.091 to AE-999.999 |
1938 |
| AF-000.001 to AF-152.105 |
1938 |
| AF-152.106 to AF-397.655 |
1939 |
| AF-397.656 to AF-740.750 |
1940 |
| AF-740.751 to AF-999.999 |
1941 |
| AG-000.001 to AG-328.075 |
1941 |
| AG-328.076 to AG-428.235 |
1942 |
| AG-428.236 to AG-447.870 |
1943 |
| AG-447.871 to AG-475.720 |
1944 |
| AG-475.721 to AG-565.750 |
1945 |
| AG-565.751 to AG-955.445 |
1946 |
| AG-955.446 to AG-999.999 |
1947 |
| AH-000.001 to AH-378.570 |
1947 |
| AH-378.571 to AH-999.999 |
1948 |
| AJ-000.001 to AJ-014.720 |
1948 |
| AJ-014.721 to AJ-333.370 |
1949 |
| AJ-333.371 to AJ-999.999 |
1950 |
| AK-000.001 to AK-057.820 |
1950 |
| AK-057.821 to AK-705.475 |
1951 |
| AK-705.476 to AK-999.999 |
1952 |
| AL-000.001 to AL-300.600 |
1952 |
| AL-300.601 to AL-665.740 |
1953 |
| AL-665.741 to AL-896.890 |
1954 |
| AL-896.891 to AL-999.999 |
1955 |
| AM-000.001 to AM-296.985 |
1955 |
| AM-296.986 to AM-629.585 |
1956 |
| AM-629.586 to AM-837.799 |
1957 |
| AM-837.800 to AM-953.999 |
1958 |
| AM-954.000 to AM-999.999 |
1959 |
| AN-000.001 to AN-175.979 |
1959 |
| AN-175.980 to AN-333.569 |
1960 |
| AN-333.570 to AN-362.988 |
1961 |
| AN-362.989 to AN-465.661 |
1962 |
| AN-465.662 to AN-661.994 |
1963 |
| AN-661.995 to AN-999.999 |
1964 |
| AP-000.001 to AP-300.028 |
1964 |
| AP-300.029 to AP-420.616 |
1965 |
| AP-420.617 to AP-999.999 |
1966 |
| AR-000.001 to AR-102.501 |
1966 |
| AR-102.502 to AR-579.025 |
1967 |
| AR-579.026 to AR-999.999 |
1968 |
| AS-000.001 to AS-001.500 |
1968 |
| AS-000.151 to AS-474.650 |
1969 |
| AS-474.651 to AS-999.999 |
1970 |
| AT-000.001 to AT-032.500 |
1971 |
| BA to BY |
Beginning 1924 |
| CA to CY |
Beginning 1964 |
| DA to DY |
Beginning 1962 |
| EA-000.001 to EA-203.878 |
1935 |
| EA-203.879 to EA-869.974 |
1936 |
| EA-869.975 to EA-999.999 |
1937 |
| EB-000.001 to EB-705.753 |
1937 |
| EB-705.754 to EB-956.428 |
1938 |
| EB-956.429 to EB-999.999 |
1939 |
| EC-000.001 to EC-589.135 |
1939 |
| EC-589.136 to EC-999.999 |
1940 |
| ED-000.001 to ED-202.377 |
1941 |
| ED-202.378 to ED-232.773 |
1942 |
| ED-232.774 to ED-242.053 |
1943 |
| ED-242.054 to ED-311.246 |
1944 |
| ED-311.247 to ED-745.856 |
1945 |
| ED-745.857 to ED-942.976 |
1946 |
| ED-942.977 to ED-999.999 |
1947 |
| EE-000.001 to EE-453.220 |
1947 |
| EE-453.221 to EE-933.528 |
1948 |
| EE-933.529 to EE-999.999 |
1949 |
| EF-000.001 to EF-600.940 |
1949 |
| EF-600.941 to EF-999.999 |
1950 |
| EG-000.001 to EG-312.860 |
1950 |
| EG-312.861 to EG-999.999 |
1951 |
| EH-000.001 to EH-012.026 |
1951 |
| EH-012.027 to EH-787.882 |
1952 |
| EH-787.883 to EH-999.999 |
1953 |
| EJ-000.001 to EJ-449.138 |
1953 |
| EJ-449.139 to EJ-999.999 |
1954 |
| EK-000.001 to EK-123.026 |
1954 |
| EK-123.027 to EK-992.399 |
1955 |
| EK-992.400 to EK-999.999 |
1956 |
| EL-000.001 to EL-999.999 |
1956 |
| EM-000.001 to EM-015.256 |
1956 |
| EM-015.257 to EM-999.999 |
1957 |
| EN-000.001 to EN-970.333 |
1958 |
| EN-970.334 to EN-999.999 |
1959 |
| EP-000.001 to EP-771.032 |
1959 |
| EP-771.033 to EP-999.999 |
1960 |
| ER-000.001 to ER-999.999 |
1960 |
| ES-000.001 to ES-238.743 |
1960 |
| ES-238.744 to ES-999.999 |
1961 |
| ET-000.001 to ET-179.954 |
1961 |
| ET-179.955 to ET-999.999 |
1962 |
| EV-000.001 to EV-019.712 |
1962 |
| EV-019.713 to EV-602.138 |
1963 |
| EV-602.139 to EV-999.999 |
1964 |
| EW-000.001 to EW-005.230 |
1960 |
| EW-005.231 to EW-020.180 |
1961 |
| EW-020.181 to EW-024.830 |
1962 |
| EW-024.831 to EW-030.680 |
1963 |
| EW-030.681 to EW-038.630 |
1964 |
| EW-038.631 to EW-045.210 |
1965 |
| EW-045.211 to EW-054.310 |
1966 |
| EW-054.311 to EW-058.440 |
1967 |
| EW-058.441 to EW-084.390 |
1968 |
| EW-084.391 to EW-100.005 |
1969 |
| EW-100.006 to EW-100.505 |
1970 |
| EX-000.001 to EX-402.914 |
1964 |
| EX-402.915 to EX-675.436 |
1965 |
| FA to FY |
Beginning 1935 |
| GA to GY |
Beginning 1935 |
| HA to HY |
Beginning 1960 |
| JA |
1924 |
| JB |
1936 |
| JC |
1948 |
| JD |
1954 |
| JE |
1961 |
| KA to KY |
Beginning 1959 |
| LA to LY |
Beginning 1959 |
| MA to MY |
Beginning 1934 |
| NA |
1951 |
| NB |
1956 |
| NC |
1961 |
| ND to NY |
Beginning 1963 |
| PA to PY |
Beginning 1954 |
| QA to QZ |
Beginning 1963 |
| RA to RY |
Beginning 1954 |
| SA to SN |
Beginning 1935 |
| SP to SY |
Beginning 1963 |
| TA to TY |
Beginning 1956 |
| VA to VY |
Beginning 1957 |
| WA to WY |
Beginning 1967 |
| YA to YY |
Beginning 1959 |
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