Colt data at Proofhouse.com
Around 1951.
Colt official police with serial # 904734 was produced around 1965
Colt official police with that serial number was produced in 1927
A Colt official police with that serial number was made in 1948.
1929
Around 1931 by proofhouse.com
Around 1943.
Manufactured in 1950
made about 1958
1959
Made in 1941.
about 1967