The production year is not stamped on a gun. It is the serial number that is used to tell which batch was made in a particular year. Go to: proofhouse.com for listings.
The Colt police positive .38 with sn 8707 was produced in 1906.The second year of production.
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For the Colt police positive .38 revolver, proofhouse,com shows 1907 as the production year.
Look on the butt of the revolver
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Good revolver.
Size
police positive special made about 1920
Check the butt
A type of DA revolver made by Colt.
That model was produced in 1922.