Coaster--molded glass with thick rim and base, probably used for furniture leg stabilization. Has a three-ring pattern on the outside bottom. Good condition with some scratches and wear on the outside bottom. None.
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LOC Thesaurus for Graphic Materials
Furniture
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Food Service T & E, Coasters (containers), City of Industry (Calif.)--Homestead Museum--La Casa Nueva, Coasters (Trays)