The original MP40 model was actually called the MP38, like its' name indicates was accepted into German service in 1938. There were three main manufacturers' for the MP38. They were; Erma, Steyr, and Haenel. The Haenel factory was run by Hugo Schmeisser, and they produced the majority of the weapons which became commanly known as "the Schmeisser". All the gun makers' were assigned letter codes. This was to confuse the Allies so that they didn't know who was making all these machine pistols. Erma was code "27" and later "ayf". Steyr was code "660" and later "bnz". Haenel was code "122" and later "fxo". Later in the war (after 1940) subcontractors were assigned to make the MP40 these were the following;
Krupp- "cos"
Merz- "cnd"
steyr- "kur"
By the end of the war the total production of the MP38 MP40 and MP41, MP40/1, and MP40/2 was 1,025,191!!
Hope this information helps you out. If you have any further questions please feel free to ask.
Matt
