Regional pictures could help: The connection pin of toggle link is supposed being fire blued; the barrel number is supposed showing strong halo. the ears are supposed showing fine tool marks. The "G...." text on ear is supposed being yellowish white (but that can be washed away, let's ignore this), bright white color is more likely being recently applied (n/a).
Are all police guns supposed having magazine safety cut? I tried "Heat Blocker" on my scrap steel bar last night, it can control 2500F within an area smaller than tiny finger nail size. So nickle steel filler melted in that region but neighorhood gun blue was not affect. Don't know how German did those, any evidence on welding?
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