1.75". Reverse has 2" long cello split along the collet with a tiny area on the side with pair of 1/16" cracks that make the slightest bump on the left edge when viewed from the front. Other than the tiny bump the front displays essentially Mint. A couple of tiny marks on the lettering of the word "Forgotten" was dirt now totally removed. Left side has just the slightest small area with a concave indent but not showing. Listed in Baseball Pin-Back Buttons by Muchinsky as R310 with $750.00 value. Rare.