A Rus or Russian Viking Belt Mount or Tip.  Based on a belt mount.  From an exhibit "Ibn Fadlan's Journey: Volga Route from Baghdad to Bulghar" in a Moscow Museum.  Several other pieces show about 25 mounts on a belt.  Available here

8th - 9th C.  Mount/Tip   1 1/8" x 3/4" 2.9 x 2 cm