This is a rare and highly sought after vintage 1960s enameled green alien UFO flying saucer charm. Two of these charms sold for over $1,000 each on eBay between 2012 and 2013 that I can document if interested. The spacecraft measures 5/8" in diameter by 1/2" in height and has tested as 925 sterling silver. What a great piece to add to your out of this world collection!
Thank you for looking!