Claymo Master Berg Christian Gottfried - Tartu - initials CGB - 1746.

ВРClaymo of an unknown master Leningrad - initials of the VR - 1736.

AKClaymo Master Kirkkenen Arvid Anton - Leningrad - AK initials

Я-МClaymo Master of the Yakov Semenov Maslennikov - Moscow - initials of the Y-M - 1756-1790.

OKThe stamp of master Kenig Otto - Leningrad - initials "OK".

CFNClaymo of unknown master Tartu - initials of CFN - 17th century

M.S.Claymo Master Skitt Mathias - Leningrad - initials "M.S."