OLD COLT: WE PROVIDE THE PUBLIC WITH AN ONLINE EDUCATIONAL RESOURCE FOR OLD COLT GUNS.
| YEAR | Approximate Serial Number Range |
| 1905 | 30000 - 30200 |
| 1906 | 30200 - 34700 |
| 1907 | 34700 - 40800 |
| 1908 | 40800 - 44500 |
| 1909 | 44500 - 48200 |
| 1910 | 48200 - 51500 |
| 1911 | 51500 - 55000 |
| 1912 | 55000 - 61000 |
| 1913 | 61000 - 67000 |
| 1914 | 67000 - 72500 |
| 1915 | 72500 - 74500 |
| 1916 | 74500 - 79000 |
| 1917 | 79000 - 84000 |
| 1918 | 84000 - 85000 |
| 1919 | 85000 - 88000 |
| 1920 | 88000 - 100000 |
| 1921 | 100000 - 105000 |
| 1922 | 105000 - 110500 |
| 1923 | 110500 - 115000 |
| 1924 | 115000 - 116000 |
| 1925 | 116000 - 122500 |
| 1926 | 122500 - 127000 |
| 1927 | 127000 - 130000 |
| 1928 | 130000 - 138000 |
| 1929 | 138000 - 149000 |
| 1930 | 149000 - 150000 |
| 1931 | 150000 - 150500 |
| 1932 | 150500 - 151000 |
| 1933 | 151000 - 152000 |
| 1934 | 152000 - 154000 |
| 1935 | 154000 - 154700 |
| 1936 | 154700 - 155000 |
| 1937 | 155000 - 157000 |
| 1938 | 157000 - 157800 |
| 1939 | 157800 - 159000 |
| 1940 | 159000 - 160000 |
