In 46 years of collecting, I can truly say I only have one regret of a card I sold or traded. I bought Bird, Dr J, Magic for $5 in 87 or 88. When no one really valued basketball cards. It was perfect. At least that’s how I remember it.
The following year, bball cards took off. I sold it for $100 at a show. That was a lot of money to a kid back then, so it was a great deal. I know exactly where I bought it from and where I sold it.
Sure would like to have it back. What is your one ultimate sale/trade regret?. Doesn’t have to be cards. Could be anything that you’ve collected.