There are 39 cards in the "Foreign Attack" set - 37 players (well 36 players plus one manager), a "Leader" card and a checklist. The player cards use what is essentially a copy of the 1984 Fleer design. Here's the front and back of Nick Evans' card (#2):
Dan had 25 sets made up - all the cards have the handwritten number on the back.
The cards look really good - here's a bunch of other examples:
You can see that these also are numbered to 25 - which makes sense because there's no way to order one set and not the other. Here's a couple more examples from the set: