You will need to get a letter from Colt or call them.
If your Colt is the 1911 military pistol, it was made in 1915.
Around 1942 for Colt military.
about 1914
you did not furnish the serial number......................
made about 1917
1912
To determine the year of manufacture for a Colt 1911 .45 based on its serial number, you'll need to reference Colt's serial number charts. The Colt 1911 was produced from 1911 onward, and the serial numbers were assigned sequentially. For example, serial numbers starting with "C" typically indicate a production year in the 1940s. For a precise year, consult a detailed Colt serial number lookup or Colt's records.
Proofhouse.com has Colt sn tables. You can also call Colt and they will tell you.
Need a detailed descriptioin
Can't be answered without the serial number.
about 1953
1915