Originally listed 1st issue yellow and blue Diamond Club card from the Del Mar racino in San Diego, CA had a 57mm wide barcode with a black box to the right of the barcode on the reverse. On the 2nd issue the barcode is 64mm wide and no more black box.

The newly found card still has the barcode and black box on the back but has "Printed in USA" above the mag strip on the left and "V" above the mag stripe on the right.