I've only seen 3 of these WaA4 proofed Police pistols with the 1920 chamber date and all had a numbered toggle pin. All were of the 'a' suffix which Jan Still suggests is indicative of newly manufactured post WW1 Lugers. I would guess, that as Ed says, the toggle pins were numbered when the sear safeties were installed after 1932. Howard C. likely knows for sure.
Lyn
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