Claymo Master Scripin Sakerdon Ivanov - Vlogda - initials of "S" - 1837-1844.

ВСClaymo of an unknown master of the Rjev - initials of the Air - 1885.

ФОClaymo Master of Ovcinnikov Fedor Alexeiwich - Moscow - initials of FO - 1881 - early 20th century

CSClaymo Master Sivers Karl - Leningrad - initials "CS"

ССClaymo Master Strelbica Samson Ivanovich - Kiev - initials of the SS - the end of the 18th century - the first quarter of the 19th century

ВСKleimo, unknown master Ordzhonikidze, initials of the Air Force, 1899-1908.

90Sample "90"