Klemo Master Nikitin Nikolai - Leningrad - initials of NN - 1845-1874.
Similar hallmarks
АФСClaymo Master of the 40in Alexander Fedorov, c. Red - initials of the AFS - 1880s.
W-SThe seal of the master Zengbush Friedrich Wilhelm - Leningrad - initials "W-S"
HHKlemo Master Haklin Henry - Leningrad - initials HH
ПРClaymo Master Rotkov Pavel Capitons - with Sidorovsky - initials of RP - 1895.
АМЧ-Claymo Master Chewarzin Anton Mihailovich - Moscow - initials of AM-- 1853-1897.
ВНЧClaymo Master Chulkov Vasili Nikolayev - initials of the NIS - end of 19 - early 20th century