Moscow's Silver Station is the initials of M-On after 1908.
Similar hallmarks
MLOPPMr. Lapp M. - Pyarno - initials of MLOPP - 19th century
6МАSixth Moscow Arthel - Initiators of 6MA - after 1908.
АММClaymo Master McLakov Alexei Mikhailov, with.
ИОХClaymo of an unknown master of Moscow - initials of the IOX - 1896.
Claymo All-Russian Association of Kiev Airmen and Jewels - 1908-1927
J.KOPFClaymo Master Copf Joseph - Tallin - initials of J.KOPF