Around 1943.
1929
Manufactured in 1950
made about 1958
Made in 1941.
Call Colt and they will tell you.
Proofhouse.com has Colt sn data.
Colt official police with serial # 904734 was produced around 1965
@1969
1970
1959
and the model is..................................
if your pistol is of the model 1911 with serial number 189558 then it was made in 1917 by colt. If it is the revolver then the serial number is to high for the 1917 revolver.