Classification house and gardenhousehold applianceappliance accessory Description A lamp holder skirt made from PBT (polybutylene terephthalate) circa mid 20th century. Designers & Manufacturers Designer (Person) Unknown Manufacturer Unknown Object number AIBDC : 009244SA Date 1935 - 1975 (circa) Country Unknown Method unknown Material plastic PBT polybutylene terephthalate Dimensions Height 35mm Diameter 34mm Colour white