New Old Stock Classic Cadillac Crest Black Chrome Gold Finger Ring. Never Used.  Size #10 which according the chart that I have is 2.45" Circumference (62.2mm), or .78" Diameter (19.8mm). 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 Rate Hikes. Thanks for looking at our ebay shop and remember "Old School Class Never Goes Out of Style!."