OLD COLT: WE PROVIDE THE PUBLIC WITH AN ONLINE EDUCATIONAL RESOURCE FOR OLD COLT GUNS.
| YEAR | Approximate Serial Number Range |
| 1920 to 1925 | 1-100 |
| 1926 | 101-249 |
| 1927 | 250-999 |
| 1928 | 1000-1199 |
| 1929 | 1200-1449 |
| 1930 | 1450-1499 |
| 1931 | 1500-1999 |
| 1932 | 2000-2099 |
| 1933 | 2100-2149 |
| 1934 | 2150-2189 |
| 1935 | 2190-2199 |
| 1936 | 2200-2299 |
| 1937 | 2300-2349 |
| 1938 | 2350-2399 |
| 1939 | 2400-2469 |
| 1940 | 2470-2499 |
| 1941 | 2500-2525 |
