New Old Stock 1950s Cadillac Crest Gold Chrome Finger Ring. Never Used. Size #11 which according the chart that I have is 2.55″ Circumference (64.68mm), or .81″ Diameter (20.6mm). 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 $5.85. Thanks for looking at our ebay shop and remember “Old School Class Never Goes Out of Style!.”