Are you sure there are 25 cards? It's quite possible only 24 were made: 8x3 or 4x6 printing sheets would make sense, but then so would 5x5.
I see the writing says "25 Designs", but this was also the timeframe where some cards were omitted from being released/printed in order to get more sales for those chasing a complete set or attempting to redeem for a prize (box of chocolates/ice skates).
PSA has only graded 24 different cards, and you would think if anyone had the other, they would get it cataloged or added to the PSA registry.
http://www.psacard.com/psasetregistr...te.aspx?c=6066
PSA, FWIW, only counts this set as having 24 cards. 100% completion for 24 required items.