File:Roman raised centre plate brooch (FindID 426122).jpg

English: Roman cast copper-alloy enamelled plate brooch dating to the 2nd century AD with a moulded, raised central section. The brooch is hexagonal in outline with a flat rim and flat projecting knops at each corner, only one is now complete, parts of three others remain and the remaining two are lost with very worn breaks. The remaining knop is a slightly angular oval shape with three concentric rings stamped on it. The centre of the plate is moulded into a raised section with convex sides, flat top and hollowed back. On the top of this raised section are two raised rings, one around the outer edge and one near the centre. The central cell within the ring is filled with red enamel. The outer cell contains a short lengh of red enamel near the edge adjacent to the lower point surrounded by an area of pale-mid blue enamel. There are traces of a second section of red enamel at 90 degrees around the rim from the first, near the right edge and it is likely the design was repeated.

On the back the remains of a triangular catchplate project from the back of the complete knop, the incomplete knop opposite has a single lug for a hinged pin on the back. In the centre of the recessed area is a small raised ring, the back is otherwise plain. It is 30.9mm long, 22.0mm across the plate where the knops are missing 5.6mm thick excluding the catchplate, 9.8mm including, it weighs 4.12 grams.

This is an unusual form as the flate raised top is unlike the more common umbonate and tutulus types. Hattatt (2000: 346) illustrates several of this type, 132, 1055 and 1569. He suggests (1982:142) in relation to no.132 that this type with the stepped raised centre is very rare type in Britain and probably imported.