Proofhouse.com has Colt sn tables. You can also call Colt and they will tell you.
Can't be answered without the serial number.
about 1914
you did not furnish the serial number......................
The lower the serial number the younger the pistol is
made about 1917
1911
A serial number would be needed to answer.
1912
1911
1911
1911
If your Colt is the 1911 military pistol, it was made in 1915.