Hi,
Yes, it all got confusing when the guys in Württemberg decided not to follow the proof laws to the letter (who knows why?).
The Crown/N, Crown/U, Crown/B and Crown/Crown U are all 'commercial proofs'. Intended for pistols that went to the commercial (non-military) market.
The military had their own proofing regulations and staff. The crown/M is a navy proof and proofing would have been done at the factory under supervision of a navy representative.
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