Dating my colt 1911
In 1931 it was decided to modernize their line by undertaking the manufacture of the external hammer, recoil-operated system originally designed by Browning and used by Colt and the Fabrique Nationale. The first pistol produced was an exact copy of the Colt Mod. For some reason this first model produced later was designated Model IV.
Not able to locate the date of manufacture for your Colt firearm? IV and is, therefore, the original Llama pistol, manufacture of which dates from 1932.