Claymo Master Panfils Alexander - Moscow - initials of AP - 1823-1840.

IWLThe stigma of the master Lundberg Johann Wilhelm - Tallinn - initials "IWL" - 1788-1806.

MIClaymo of unknown master Ryazani - initials of MI - 1789.

И-АClaymo Master of Alexeiev Ivan Alexeiwich - Moscow - initials of I-A

LMThe stigma of the master Michelsen Leopold Eduard - Tallinn - initials "LM" - 1847-1888.

МТClaymo Master of Tarasov Mihail Yakovlevic - Moscow - initials of the TMT - 1905-1914

AIClaymo Master Josep Alfred - Tallin - Initiators AI - 1920-1940.