Vintage Tiffany & Co. 18K gold over sterling silver NASA space emblem tie tac with Tiffany box & pouch. The oval shaped tie tac measures 5/8" x 7/16' and weighs 2 grams without the backing fastener. Very good condition with modest if any wear. Stamped Tiffany & Co. 18K over sterling silver. Please enlarge all pics for best details. Starts low with no reserve.