Around 1912.
No sn = no way to answer.
1910
1910, first year of production for police positive .22 target model G & C
police positive 38 cal. #13853 made about 1908
You do not say if you have a police positive in 38 special or a 32 cal & target model,or a police positive special.So if you have a 38 special police positive it was made in 1929,if you have a 32cal& target model that was made in 1927,and if you have a police positive special model that was made in 1923.
1927 for a police positive special
Produced in 1939.
1925
On the butt
if it is a 38 cal. about 1921
For the Colt police positive .38 revolver, proofhouse,com shows 1907 as the production year.
@1919