Horseman advancing right, holding a spear, letters "ΠC" below / Inscription in 5 lines "TSAR I / VELIKIY/KNYAZ IB/AN VSEYA/RUSY" ("Tsar and Grand Duke Ivan of all Russia"). 13mmx11.5mm, 0.63 grams. Pskov mint. Grishin #77; Russian Wire Coins #77.
This is a full kopeck (not a denga). The coin was minted in Pskov in or slightly after 1547.