Here are six gorgeous green Pillar Optic water tumblers. Pillar Optic, also known as "Logs" and "Log Cabin", was produced by Anchor Hocking from 1937 to 1942. The tumblers measure 4" tall and they each hold nine ounces. They are in excellent condition with no chips, cracks, or flea bites, and showing little or no indications of use. The tumblers are pictured in "Collector's Encyclopedia of Depression Glass" by Gene & Cathy Florence.