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A fragment of metalworking mould.

The surface has a partial impression showing the negative impression of a boss. The mould surface has a ridge along one side which has a strait line incised, next to the ridge ispart of an inverted dome. The fabric has a dark grey surface and light grey margin, with an pale orange external margin and surface.

From Group F, Keying Bosses One of five keying boss fragments from St Patrick's Chapel that all make similar round shapes. As keys for bivalve moulds they lack the asymmetry found on early medieval moulds elsewhere. The alternative interpretation is that they represent the casting of central hollow bosses on larger castings.

Canoloesol Cynnar, dernyn mowld ceramig i gweithio copr