Sort of two parts for me.
In 74 they had the Hank Aaron specials showing all his cards. I told a friend of mine I'd really like to get some of them. he said his brother had some, but not Aaron and he'd see if he could get one. But I'd have to swap somereally good cards.
A couple days later I swapped what was probably a fistful of 74s, likely all As and Red Sox for a 68 Matthews. It's pretty beat but I still have it.
(Ok, it was only 6 years old at the time, but I was 11 and my oldest card was from 1969. At the time it seemed like an ancient card)
Around 77-78 I had moved to a new town and Halls was on my way home from school. Wow, stuff that was very old, T206s, boxes full of cards from the 50's and 60's all sorts of fascinating stuff. I wanted T206, they were 1.50 and they'd mounted them on 3x5 cards with a piece of 9 pocket page, and the cards had some stats typewriten on them. Must have been a few months later, they weren't doing the 3x5 card thing anymore. One day I stopped in and they said "look at this before you buy something" It was a truly awful T206 Beckley. Polar bear, no stains, but totally beat. Held together by tape. But it was only 20 cents! And they'd set it aside just for me.
I still have that one too. It got me started on older cards, and although I didn't know it at the time, it taught me a great lesson about how to really run a hobby business right.
Steve B