Vern,
Thanks for the reference. I think the instruction itself is ambiguous. Although part you mention does say that "...pistols obviously out of aim will be marked Z...", the paragraphs which are referred to at the end of the instruction seem pretty clearly (to me) to refer to the targets and written records of the guns which are to be marked, not the guns themselves.
The only rejection stamp which marking instructions clearly refer to is A (Ausschuss, "rejected part" or "scrap"), see G�¶rtz&Bryans p.118. On p.114 there is an instruction which explicilty permits Z being used as a worker's mark. Having the same letter as a standard marking -and- as a rejection mark would seem to be very confusing.
You are right that G�¶rtz&Bryans is an extraordinary source book, I depend on it often.
--Dwight
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