Need to complete a set? Though unmarked, this vintage mug is most likely made by Hazel Atlas. This rust color coordinates with their Sierra rust color and this shape and handle are known to Hazel Atlas. The fired on paint over milk white, or Platonite, glass remains in Excellent Condition. The mug is 3" tall x 2 3/4", measuring the same size as the Hazel Atlas Kiddie or Children's mugs in this same color.