Model 1921 misssing in action.

Here is some additional info: I have a letter dated october 30, 1943 to one Lt. Langerman, Security Officer,83rd Air Depot from Walter.E. Beck Rep. Liaison, M.E. Projects #4 Midan Tewfik, Cairo, Egypt. He states that the " 1915 Luger " was in my fathers possesion between two and three months before Pearl Harbor." in an additional letter dated November 6 1943, the luger is described as a model 1925 but there is a change in pen on the letter which looks like 1915. however later in the letterThe "model 1921" is hereby returned".... hope this helps a little.