Russian .875 silver. The mark on the left, with the year, is the assayer’s mark. I believe it’s Andrei Kovalsky (Moscow, 1821-1856). 1842 in your case. That weird blob on top is in fact Saint George from the Moscow coat of arms. And the one in the middle is the maker’s mark, which is upside down AK, an unknown maker (according to Postnikova-Loseva) specializing in niello at that time. Here’s anothe example
https://www.artantique.ru/item/42325/
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