You are looking on one 3 1/2" by 5 1/2" Real Photo Postcard. "FAMOUS CRYSTAL CAVE Pennsylvania" This item is in very good condition and has never been postally used. The front is a picture of the cave with the inscription "Giants Tooth and Tobacco Leaves Crystal Cave, Pa.". The back reads as follows: "This great Natural Underground Wonder discovered 1871, is located midway between Allentown and Reading just a short distance from US #222 or #22-#78. Oldest Operating Cavern in eastern United States. Visited by thousands annually. Guided Tours, Picnic Park, New Dutch Gift Barn."This is a Lusterchrome card published by Crytal Cave Co. Inc. Kutztown, Pa. Add this rare one to your collection now. Thanks for Looking.***Powered by eCRATER