Claymo Master Mikhail Vasiliev - Yaroslav - initials of the MK - 1820-1850.

АКClaymo Master Colotichin Alexei Fedorov - Jaroslavl - initials AK - 1842-1876.

Probile brand on articles from platinum, gold and silver approved by the USSR Ministry of Finance, 7 January 1954-1958 - Rije Inspection

ЗШClaymo Master Scherbakov Ziniya Efimov - der. Malanino, initials of ZS, 1898.

Probile brand on articles from platinum, gold and silver approved by the USSR Ministry of Finance, 7 January 1954-1958 - Tallinn Inspection

Probile label on articles of platinum, palladium, gold and silver approved by the Ministry of Finance of the USSR since 7 May 1958 - Moscow Inspection

Probile brand on articles from platinum, gold and silver approved by the USSR Ministry of Finance, 7 January 1954-1958 - Kiev Inspection