 DATE: The gun Cal uses is in fact a model 1911A1, a modified version  of the 1911 that didnt appear until 1926. The main distinguishing  feature is its curved mainspring housing (bottom part of the grip),  which on the 1911 is straight. Even if it were the standard 1911,  that model had only been used by the military for a few months, and  was not yet available in the nickel plating shown; the civilian  version had only been available for about a month.