Claymo Master Cybert M. Harkov - initials of M.ZYBERT - after 1908.

FABERGEClaymo Master Faberge - Leningrad - FABERGE initials

EWINDISCHClaymo Master Windish E. - Vilno - initials EWINDISCH - 1899-1908.

ГРАЧЕВЪClaymo Master Grachev Gavriel Petrovich - Leningrad - initials of GRACHIV - 1866-1873.

A-SPERClaymo Master Schper Adolph - Leningrad - A-SPER initials

ЩЕКЛЕЕВClaymo Master of Szczecleev - Kiev - the initiators of SCHUCKLEEV - the beginning of the 20th century

MEYERMr. Meyer Karl Friedrich - Leningrad - initials of "MEYER"