Claymo Master of Matvey Borisov - Moscow - initials of MK - 1805-1808.

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

МЯClaymo Master Yakovlev Mikhail - Moscow - initials of IA - 1821-1823.

Д-МClaymo of an unknown master of Moscow - initials DM - 1758.

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

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

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