Claymo Master Krautzwedel Johann Georg - Leningrad - initials of the IGK

ИГРIvan Gavrilov's der. Sydorovsky's burglary is the initials of the EGR, the end of the 19th century

СИАClaymo Master Agafons Sergei Ivan. - Moscow - SIA initials - 1883-1884.

ВНЧClaymo Master Chulkov Vasili Nikolayev - initials of the NIS - end of 19 - early 20th century

М-Я-МKlemo Master Michael Yakovlevic - Moscow - initials of M-Y-M - 1808-1824.

АПClaymo Master of Kidney A. - Ufa - initials of AP - 1849-1851.

FWSTClaymo Master Wennerström Olof Frederick - Leningrad - initials FWST