Nothing says 1991 more than Pro Set, which was at the height of its powers in the early '90s before their inevitable collapse. I also think that no one made more promo cards than this company. This is a pack that I found at the bottom of some box I've had for decades. It looks to have been released to promote all of their products, as you'll see in a bit.
1 - Emmitt Smith (Pro Set Gazette) - As far as I can tell, this is the only actual promo card in the pack. The rest of the cards appear identical to their set counterparts and are probably not unique in any way, although you can never really tell with Pro Set. It's an interesting concept for a set even if it was never realized. There's no stats -- instead, you just have a write-up that you might find in a local newspaper.
186 - Tom Barrasso (Hockey) - This is a really cool overheard shot of the Penguins goalie. There were both French and English language versions of this set. This is the English version.
98 - Car 26 Quaker State (Racing) - I'm not even going to pretend to know anything about auto racing. The car is green. You don't see that every day.
83 - Nelson (MusiCards) - This is familiar territory to me. I believe at one point I bought a whole box of this stuff. I still probably have some of it somewhere, if I didn't throw it away. I wasn't actually interested in almost any of the music in this set at the time (Nelson?!), but I still bought the cards just the same.
75 - Curtis Strange (Golf) - That Nike shirt goes really well with the card border color. It really does. I was always more of a fan of video game golf than actual golf, so I probably didn't watch Strange do his thing too often.