Mr. Mikhail Ivanovich - Leningrad - initials of M.B. 1892-1912.

ИБClaymo Master Baldine Ivan Vasiliev - Sidorovsky - Initiators of IB - the beginning of the 20th century

КРClaymo of an unknown master Leningrad - initials of the CR - 1884 - after 1908.

ГАThe stigma of the master Artemyev Gavril - Moscow - the initials "GA" - 1704-1746.

П-АKlemo Master Antonov Petr - Moscow - initials "P-A" - 1742-1771.

ЕЕThe stamp of the master Evdokimov Evdokim Evdokimov - Moscow - initials "EE" - 1739-1780.

АЧClaymo Master Chulkov Alexandre Konstantinov, c. Red - Initiators AH - 1898