A Rus or Russian Viking Belt Mount.  Can be used as a belt tip.  From an exhibit "Ibn Fadlan's Journey: Volga Route from Baghdad to Bulghar" in a Moscow Museum.  Several other pieces show about 35 pieces on a belt. 8th - 9th C.  7/8" x 5/8" 2.3 x 1.6 cm  This order is for 35 of the mounts to complete a full belt!