Cyrillic legend within a dotted border C+E Λ KHZb BACIΛ EIBV (abbreviated "Grand Duke Vasiliy Vasiliyevich") / Duke enthroned, holding sword, letters K-H (for "Knyaz" - Duke). 15mmx12mm, 0.75 grams. Moscow mint, struck 1435-1435. Guletsky/Petrunin #660 var.
Extremely rare early Russian coin!