3rd-7th century AD. A chalcedony cloison with intaglio profile male bust with crown and garland, mounted in a later silver-gilt ring. 5.08 grams, 26mm overall, 19.43mm internal diameter (approximate size British S 1/2, USA 9 1/2, Europe 21.0, Japan 20) (1"). The Signo collection, the property of a West London businessman, formed in the late 1980s-early 1990s.