A Fire-King mug is a milk glass, jadeite, azurite or vitrock coffee mug or sometimes cup, which was made by American company Anchor Hocking Glass Corporation (Anchor Hocking) between about 1940 through about 1979. Collectors can find these mugs for sale on ebay. There are also a lot of Japanese websites that offer the mugs as the Japanese love Fire-King.
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Found via the style files