Made about 1972, 37 years old, for a Colt police positive special with that serial number
about 1973
Look on the butt of the revolver
Check the butt
That model was produced in 1922.
1929
Colt official police with serial # 904734 was produced around 1965
police positive special made about 1920
1919-1922
Proofhouse.com has Colt sn data.
1967
made about 1958