File:Roman copper alloy disc brooch (FindID 425666).jpg

English: An enamelled Roman tutulus disc brooch dating to the second or third century. The brooch is flat, circular and originally had eight circular lugs around the rim; four are missing. In the centre is a raised circular boss. The brooch is highly decorated with different coloured enamels set against each other without the use of a metal divider.

Each lug is filled with orange enamel. The main body is divided into two main enamelled bands; the outer contains light blue enamel whereas the inner contains dark blue/purple enamel. The outer band was originally decorated with eight small concentric circles of different coloured enamels; only four survive. Each concentric circle comprises an outer band of white enamel, an inner band of red enamel, and presumably a central pellet of white enamel. These concentric circles are spaced evenly around the brooch. The inner band is also further decorated by four rectangular cells of white enamel spaced evenly around the brooch. A pedestal-style stem with a circular boss extends from the centre of the brooch. The boss is concave but has a small prong in the centre. The concave area has some evidence to show that it may have been filled with dark blue/purple enamel.

An elongated triangular strip of copper alloy is located across the centre of the reverse of the brooch. It is unclear whether this is an applied strip or whether it is part of the original casting. The top and bottom of the strip are broken and no spring/pin or catchplate is visible.

The technique of juxtaposing different enamel colours in large fields without metal divisions is a recognised trait of British brooch manufacturers (Bailey & Butcher, 2004: 178).