Damaged boss, height 10cm, diam. c. 17cm. Largish stud (diam. 4cm) above concave dome, marked carination, indented waist and wide sloping flange. Flange mostly missing, but originally five disc-head rivets diam. 2.8cm Slight wood or leather remains on underside. This boss has been repaired in antiquity. Clear indications on one side that a new flange was welded on. N. Thames?