The breechblock is indeed the frontmost piece of the toggle train. The suite of proof marks applied to Lugers by the state proof house at Suhl includes horizontal c/Ns on the left frame and receiver, and a c/N stamped on the top surface of the breechblock. Absence of the breechblock c/N, along with the Weimar-era dove/WaA, strongly suggests that the breechblock is a later replacement taken from a different gun.
The letters under the grips are workers' marks. They were applied during manufacture by production line workers or supervisors, probably to certify completion or inspection of a task--the details of their application is unknown.
--Dwight
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