Claymo Probe Master of the Great Ustuga - the Mihail Gavrilov Finals - M-O initials - 1755-1775.

Features
- Category
- Assay masters
- Alphabet
- 1767 М-О
- Years
- 1755–1775
- Shape
- Square
Description
The stigma depicting the initials of the test master Okoshnikov Mikhail Gavrilov, in the upper part of the stigma there is a year "1767", in the lower part of the letter "m" and "o". Master was born in 1722, the first test work of the Great Ustyug (1
Similar hallmarks

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