A boldly embossed CD 188 in light green. PAT'D over NOV.23d 1886 The insulator is in extremely good condition. There is a ping (shallow, less than 1/16" in diameter) and a peck (that's way smaller than a ping), both away from the embossing. Price guide says $50 - $75. This one should be at the high end but I'm pricing it at $50.00 plus actual shipping cost to your U.S. address. PayPal (friend mode), check or money order.