Someone at the Topps factory was having a bad day. After printing the photos, they forgot to flip the sheet over before putting it in the printer, so 1) backs got printed on the front and 2) the back got printed on the card it was opposite of on the sheet. So the card with the Frank Viola front has Wayne Gretzky's back printed on the front, and vice versa. The backs are blank. It appears that the gold foil printing was skipped altogether, but the sheet was still cut and then released into the wild. This lot has both halves of the mistake, Viola with a Gretzky back on the front, and Wayne Gretzky with the Frank Viola back overprinted.