use 32-20 ammo The caliber of the ammo is 32-20. It is not common although it is still available.
Colt official police with serial # 904734 was produced around 1965
Made in 1929.
If your Colt official police is chambered in .22cal?Then it was made in 1937.
your colt official police was made in 1958.
1940
1929
1967
Around 1943.
Manufactured in 1950
made about 1958
Made in 1941.
@ 75 years old