Claymo Master Begak R. B. - Vilno - initials of RB - 1890 - early 20th century
Similar hallmarks
П.ОClaymo Master Pavel Akimov - Moscow - initials of P.O.
ВСClaymo Master Semenov Vasily S. - Moscow - Initiators of Air Force.
ЯСClaymo Master of the Forty Yakov Nikolayev, with the red initials of the YAS, 1898.
GKClaymo Master Costamo Georg - Leningrad - initials of GK
ССClaymo Master Semiginsky Semen - Kiev - initials of SS 1750-1787.
ОКClaymo Master Kurlukov Orest Fedorović - Moscow - initials "OK" - 1884-1916.