Mr. Nordberg Joseph - Leningrad - I-N initials

ГЧClaymo Master Chernavkin Grigori - Moscow - initials of HF - 2nd. 18th century

А-НClaymo of an unknown master of Moscow - initials of A-N - 1829.

N.P.Claymo Masters Nicoles Carl and Plynke - Leningrad - initials N.P.

А.ЧClaymo Master Chevarzin Anton Mihailović - Moscow - initials A.C.

FFClaymo Master Fresen Frederick Ahatez - Leningrad - initials FF.

Г.ИClaymo Master Ivanov Grigori - Leningrad - initials of G.I. - 1841-1857.