You can find out at Proofhouse.com
The list I have shows a Colt new service with that serial number as being made in 1915.
made about 1911
About 1903.
1923
1918
about 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.