Impossible to answer without the serial number and a detailed description of all markings, features, barrel length, sights, grips, box, papers, accessories, condition, type of action, etc..
1957
A Colt official police caliber.22 with the serial number 1478 was made in the first year of production ,1930.
You need to call Colt. The sn is not listed.
100-400 USD
your colt official police was produced by colt in 1933.
made about 1914........................ I disagree. Colt first produced the Official Police model in 1930. "Proofhouse.com" says that Colt began 1935 Official Police models wih serial number 4000 and 1936 began with number 11000 so your pistol was made in 1935.
Your colt official police was made by colt in 1940.
Your colt official police was made in 1951.
That Colt official police was made in 1935,
Your colt official police was made in 1939.
Around 1941 for Colt official police
Your colt official police was made in 1967.