The Vintage Fire King Jadeite Heavy C Mug Cup is a 3" green glass mug with a round shape, signed by Fire-King. Manufactured in the 1950s, this original piece of American diner ware features a glossy finish and is suitable for hot beverages. Hand wash only, this decorative and collectible item is a unique addition to any kitchen or dining collection. Made in the United States, this vintage piece exudes charm and nostalgia for the 1950s era.