The stigma of the master Ivanov Grigory Ivanovich - Moscow - initials "IGI"

И-ЛClaymo Master Libman Ivan - Leningrad - I-L initials

НТClaymo Master Timofev Nikifor - Moscow - initials of NT 1732-1750.

М.ИThe stamp of the master Isakov Mikhail Yakovlevich - Leningrad - initials "M.I" - 1889-1899.

И-МClaymo Master Mikhailov Ivan - Moscow - initials I-M - mid-century of the 18th century

ИГClaymo Master Grigoriev Ivan - Leningrad - initials of IG - 1825-1862.

М-КThe hallmark of the Moscow assayer - Mikhail Mikhailovich Karpinsky - initials "M-K" - 1800-1824.