Ben,
The particular small parts were straw finished from the very beginning by all manufacturers, from the prototype until dip bluing was used by Mauser, phased in in 1937--Apparently the last general production/military examples from early 1937 are rarer because they were the last of this finish. Contract (banner) Lugers after that could be straw finished, I suppose on spec from whatever entity ordered them. And of course, the Parabellum pistols made by Mauser in the 70s had strawed parts.
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"... Liberty is the seed and soil, the air and light, the dew and rain of progress, love and joy."-- Robert Greene Ingersoll 1894
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