Manufacturer's codes

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During the Nazi era it was the practice for German manufacturers to put a code mark on their military products rather than their name. In the early Nazi era this is understandable as an evasion of the Versailles treaty. But once Hitler was openly thumbing his nose at it, why keep up the pretense? Not much point during the war.

For example the Allies knew where mauser was located and knew jolly well they were cranking out firearms. They probably had other fish to fry than bombing mauser.