Dwight,
I think at least one of the guns with a "chipped" breechblock you looked at was my Mauser Oberndorf SN # 1375v, it is "chipped" on both sides of the extractor. Although these were the first guns made by Mauser in the Oberndorf facility the toggles are marked DWM and are generally accepted as being from left over parts. The rest of the gun show the tell tale machining characteristics of the Mauser made guns. The finish on the toggle is significantly different than the rest of the gun as well and this is noted as being correct in Lugers at Random (page 250, new edition). I don't know if this actually helps with the question on metallurgy of early and late production but it is curious that the damaged part was from the earlier manufacturing. Because leftover parts were used it would be difficult to tell if the breechblock in question was from the WWI or earlier era or from the after war era.
I have seen other Lugers with chipped breechblocks but never paid enough attention to them to assess if they were all from one manufacturer or one era; anyone else have any of these damaged guns? Maybe we can pull together some data to look at?
Bob M.
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