I started a 1956 Topps set and planned to work on it slowly. It is stalled for now, but I still have a 1955 Jackie Robinson I bought for the set.
I also once bought two Early Wynn 56 Topps at the same time and didn't even notice until I left a card show. I went through a huge stack and bought about 12 cards from some guy and Wynn was the top card and bottom card in the stack. I guess it took me so long to go through the cards that by the time I got to the second Wynn, I forgot the first one