Assay Master's Mark of Veliky Ustyug - Mikhail Gavrilov Okonishnikov - initials "M-O" - 1755-1775
Hallmarks-Assay Masters
- Letter: 1767 M-O
- Year: 1755-1775
- Shape: Square
- Description: Mark depicting the initials of assay master Mikhail Gavrilov Okonishnikov. The year "1767" is at the top of the mark, with the letters "M" and "O" at the bottom. The master was born in 1722 and was the first assay master of Veliky Ustyug (1755-1775). Shape: Square
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