A Roman iridescent colourless glass cage cup, the Constable-Maxwell Cage-Cup, circa A.D. 300 ; blown or cast in colourless glass, wheel-cut, ground and polished, the hemispherical body with a rounded base and curved, out-splayed rim, the decoration comprises a faint horizontal ridge below the rim and above a collar consisting of a projecting openwork flange with 103 perforations separated by darts
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