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[N] ca. 1799? .. i have seen N with inscription from 1802 and 1805.
Probably it was used a time periode.
MZ: [CCK] = Carl Christoph Karpienski (ref. [Scheffler, Goldschmiede Ostpreußens] Nr.12 #430) , oo 16.3.1794 Helene Kern.
I can't see any contradiction to the FW mark (1809-1812).