This letter form is not represented in Costanzo. This is not conclusive, but certainly significant.
The inspector marks found on Erfurt parts are clearly three-lobed crowns--the marks pictured are clearly two-lobed.
Erfurt sideplates are found with the inspector stamp and serial number stamped adjacent on the part's face. On the sample above the sideplate appears to be numbered on the bottom edge?...not on the face, in any case. Is there an Imperial inspector stamp on the trigger lever itself?
Allowances need to be made for detail differences in a common stamp due to the abilities of the die cutter, the relative time two dies might be made, or the size of the stamps. I would guess that the sear stamp is smaller than the sideplate stamp, is this so?
I'm not sure that "many" firing pins would have been found fluted at a later date. Personally, I consider fluted firing pins to be post-Imperial manufacture unless other evidence--the presence of an Imperial inspector stamp, for instance--demonstrates otherwise. It would be useful to know if this striker is serial numbered--another helpful (but not decisive, on its own) piece of evidence.
Tom's comment is interesting.
--Dwight
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