The only known surviving element of a Romanesque mirror case, this flap was originally slotted and connected by a clasp to a similar one. Polished silver mirrors were inserted into the inner facets. The surface of the cast and embossed case was carefully crafted and resembles enamel painting. The dragon patterns can be compared to those on the cup of a drinking cup and on the lid of a Bertinus chalice. The leaf-shaped lugs and attached rings are modern additions.