Claymo Master Feirabah Johann Wendel - Leningrad - initials I.W.F

G-M-TClaymo Master Tolpo Gabriel Martin - Leningrad - G-M-T initials

А.М.ЧClaymo Master Chevarzin Anton Mihailovich - Moscow - initials "A.M.C." - 1853-1897.

FWSTClaymo Master Wennerström Olof Frederick - Leningrad - initials FWST

П.А.Л.Claymo Master of Lobanov Petr - Moscow - initials of P.A.L. - 1861-1883.

TAPPERClaymo Master Tapper Henry - Leningrad - TAPPER initials

Д-Н-ДClaymo Master Dubin D. N. Leningrad - initials D-N-D - 1849-1854.