David, this is a very interesting luger and one, I hope, begets more comments from Forum members. The strange "U" marking on the forward toggle may be a symbol for a pressure test luger. The closest thing I could find is on page 301 of Kenyon's Lugers at Random, but the marking is a "Ub" and it's on the chamber. The extractor is cherry in color, typical of later Mauser dip blueing. Hope other folks' ideas come forth.
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