They made six sizes of plain ring chips but the ring around your TANGO looks to be a unique size in fact, everything about the chip is unique...the square edge...the 4 LEAF CLOVER... It's like they were sending an obvious message... "GOOD LUCK with your new venture!" I remember finding 4 leaf clovers when I was a kid in Michigan and they could be found but they were very very rare. It is a unique and very beautiful chip Rich and in my humble opinion... one of a kind. I hope you do not mind me harvesting the pictures for my future web site with a direct reference to your site. Thanks for sharing Rich. Sweet Chip!