Claymo Master Shik M. - Moscow - initials of M. SCHICAN - 1886-1889.

Г.ШАНГЪClaymo Master Shang G. - Kursk - initials of G. Shangj - 1859.

М.САЕТЪClaymo Master Seth M. - Leningrad - initials of M.SAETNO - 1899-1908.

Th.GRUHN"Th.GRUHN" was the beginning of the 20th century

ГIЛУРIЗЕClaymo Master Iluridze - Tbilisi - the initials of GILURIZ - the end of the 19th century

I.МАРШАКЪClaymo Master Marshak Josif Abramovic - Kiev - Initiators I. MARSHAKJO

I BRANDClaymo Master Brandt Jacob Andreas - Rakver - Initiators I BRAND - 1850.