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Polycandelon in the form of a pierced disk with openwork cross and nine circular perforations; Period: Early Byzantine, circa: 6thc.-7thc. Materials: copper alloy. Dimensions: Diameter: 279 millimetresHeight: 757 millimetres (suspended)Weight: 1.626 kilograms. British Museum is closed 24, 25 and 26 December and 1 January, but is open every other day of the year. Fast facts about the British Museum: Founded: 1753, Collection size: 8 million objects, Oldest object in the collection: Stone chopping tool (nearly 2 million years old).