I have never seen an actual field armourers'parts chest. Bender, Luger Holsters and Accessories, shows two such chests and the contents. It would be interesting to know how the parts contained in such a chest were marked/numbered. As Lugerdoc points out, S/42 and 42 were used to indicate replacement parts. I have seen grips, loading tools and magazines so numbered.
FWIW, Several years ago I saw four toggle pins that I was told were parts from an armourers' tool box. They were oversized pins and were stamped on the head with numbers indicating how much each was oversize. Been a long time, however, I believe that each was .05mm larger than the other, starting with .05mm. Seems as though they were acceptance/approval stamped also, however, if they were can't recall what it might have been. As my recollection clears after a taste or two, it seems to me that lugerdoc had these verysame toggle pins. But then I may be wrong.
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