New Old Stock Classic 1950s Cadillac Crest Logo Silver Chrome Finger Ring. Never Used. Size #12 which according the chart that I have is 2.63″ Circumference (66.92mm), or .84″ Diameter (21.3mm). These can run a 1/2 size up or down. Very Unique Cadillac Collectible that is handmade on my workbench using a vintage discontinued licensed General Motors Hat Pin. High Quality Class. Custom made. USPS First Class Shipping to your USA Address will be $8.00 Thanks to the recent USPS Price Hikes. Please check our other ebay selling site: “tjmarz” for similar products. We do our best to combine shipping from both sites to save you money. “Old School Class Never Goes Out of Style!.”