A Rus or Russian Viking Belt Buckle. 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 35 mounts on a belt. Available here
http://raymonds-quiet-press.myshopify.com/products/viking-belt-mount-35-of-rus-n-74
8th - 9th C. Buckle - 1 1/2" x 1 5/8" 3.8 x 4.1 cm, Mount/Tip 7/8" x 5/8" 2.3 x 1.6 cm