about 1918
The list I have shows a Colt new service with that serial number as being made in 1915.
You can find out at Proofhouse.com
made about 1911
About 1903.
1923
1918
1916.
Check the butt.
if it's a New Service model it was made about 1920
Around 1917.
Your colt was made in 1916.
Your colt was made in 1916.