1989 Topps #720 Blank Front

This is an blank front error of the '89 Topps card.  I've seen a lot of blank backs over the years, but not many blank fronts (of anyone not just Wallach).  It doesn't show well in the scan because it's white, and slick, like a normal card front.

I could be way off on this, but I don't ever remember Donruss or Fleer producing blank back cards in the 1980's.  Something that was unique to Topps.  I'm not wild about these errors myself, and they are not something I actively pursue.  I'm not grading this card, or counting it towards the over-all number of cards I have, because I don't really consider it a card.

*Update Jan. 31, 2013*
Upon further review this card has been added to the '89 Topps tally, but is only be counted as 1/2 a card.