Mike -
I am curious; wouldn't that magazine actually match up with at least two Lugers and possibly more???
My reasoning is possibly 80,000 Lugers were made in 1936 and again in 1937, plus this 'style' of magazine may have been continued (or preceded) for a year or more after/before...
Does that sound reasonable???
I don't have that number Luger but I'm sure if I did I could come up with a convincing story to go with it...