Copper-alloy, enamel and silver, 13.09 grams, 32.45 mm. Circa 2nd-3rd century AD. A cast copper-alloy mount formed as a rectangular plate with openwork scrolled edges. Behind the upper plate is a second plate with a central square void supporting the decorative plate on four posts, each about 7mm long. The upper plate contains an inlaid silver square with dentilled outer edges, surrounding a panel of red enamel and an inlaid silver tetragammadion or swastika with curved arms. The tetragammadion was a symbol of good luck which often appeared on Roman military equipment. Reference: cf. similar scrolled openwork plates from the Dura Europos excavations published in James, S. Excavations at Dura Europos 1928-1937. Final Report VII. The Arms and Armour and Other Military Equipment, London, 2004 items 318, 319. Very fine condition, complete. Provenance: from an old English collection.