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