Proofhouse.com and the Blue Book of Gun Values are two places that you can start with
about 1892
You will have to call Colt to find out.
By model and serial number. Go to proofhouse.com
Proofhouse.com has Colt sn data.
Proofhouse.com has Colt sn tables.
probably WW1 era.................
1919
That Colt police positive special with serial # 594826was manufactured in 1951.
1967
It was manufactured in 1920.
Manufactured in 1950
around 1951.