1907-1909
1919-1922
About 1959
1927
Yhe records I have show a Colt police positive .38 with that serial number as being made in 1908.
Look on the butt of the revolver
1929
Check the butt
police positive special made about 1920
made about 1958
Manufactured in 1950
Around 1943.
Made in 1941.