Not really one big deal card for me, but a few small ones.
First pack, 1969. I got Reggie, and remember dad saying "hey he's pretty good!" That stuck with me, but oddly I bought none in 70, one pack in 71, and none in 72? Weird.
Then 1974 and the Hank Aaron specials. I knew there were older cards, since I had some as old as 1969, but those really made it interesting. Traded for a 1968!
Then I moved to a town with a card store. With T206s, T205s, Goudeys, Old Judges! And it's been downhill since
Steve B