Beautiful Milk Glass coaster with an apple blossom center design was produced by Hazel Atlas Glass circa 1960s. This coaster was found inside the box of Moroccan Amethyst Tumblers. It is approximately 3.75 inches in diameter and in very good condition with no nicks, chips or cracks. These are floating around as ashtray and even pin dishes, but really are coaster. This information can be found in Collectible Glassware from the 40s 50s 60s Seventh Edition by Gene & Cathy Florence.