The stigma of the master of Korenkov Ivan Matveev - Kazan - the initials "Korenkov" - 1871-1894.
Similar hallmarks
С.НАЗАРОВЪKlemo Master Nazarov Sergei Ivanovich - Moscow - initials of S.NAZAROVINA - 1880 - after 1908
К.ФАБЕРЖЕClaymo Master Faberge Petr-Carl-Moscow - initials of C.FARGE
П. ОвчинниковClaymo Petersburg branch of the Moscow firm P. Ovchinnikov - 1873
ПМИЛЮКОВЪClaymo Master Milukov Petr Pavlovic - Moscow - initials of PIPLUKOVO - 1877-1912.
ФАБЕРЖЕClaymo Master Faberge Petr-Carl-Leningrad-FABERGE initials
ИЕЗKleimo, unknown master Kiev, initials "H" and "YEZ," 1892 after 1908.