Anchor Hocking Fire-King milk glass stacking mug. Heat-resistant milk glass (often marked "Oven-Proof" on the bottom). Screams 70’s and likely from the 1960s or 1970s.The glass is very thick and creates a heavy feel. Nothing is stamped on the bottom of the cup.
Produced under their iconic Fire-King ovenproof glassware line. Manufactured at the company's primary glass plant located in Lancaster, Ohio.
