made about 1918
Based on serial # 313213, It was manufactured in 1910. (312000-315999)
Need to know the Colt model.
If that is the colt combat commander, it was manufactured in 1962.
Proofhouse.com has Colt sn data
You will have to call Colt to find out.
You will have to call Colt to find out.
1967
About 1921.
1897
@1972
You can find out at Proofhouse.com in the Colt tables.