Horseman advancing right, holding a spear, letters "ΓP" below / Inscription in 5 lines "TSAR I / VELIKIY/KNYAZ IB/AN VSEYA/RUSY" ("Tsar and Grand Duke Ivan of all Russia"). 14mmx11mm, 0.64 grams. Pskov mint. Griszin #79; Russian Wire Coins #79.
This is a full kopeck (not a denga). The coin was minted in Pskov in or slightly after 1547.