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

А.ПСClaymo Master of Stroms Alexander - Leningrad - initials of A.P. - 1865-1875.

АМГClaymo Master Goodkov Agafon Martianov - Leningrad - initials of AMG - 1869-1908.

ДДКKleimo Master Kalein Dmitri Dmitriev - with Red - Initiators DDC - end of 19th century

МАКClaymo Master Colomin Mark Andreev, Sidorovsky, initials of the MAC, 1898.

ГИМClaymo Master Mernikov Grigori Ivanov is a der. Stepurino is the initials of the GIM, 1898.

И.С.ГClaymo Master Hubkin Ivan Semenović - Moscow - initials of I.S.G