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Hi. Koenigsberg, master BOHNHARDT C.G, when did he work? (Z)-What year is it?

Carl Gottlieb Boehnhardt worked in the first half of 19th century. I think the letter Z stands for 1841.
Regards silverfan

silverfan --- Thank you for your attention to the topic, I typed the stamps by year, it turns out (Z)-1842 g???