I found a striped plum (pic of tomato in my hand) in Barcelona, Spain a few years ago in the Caterina Public Market and brought back seeds. I grew out a plant (the fruit looked similar) and crossed it with Large Barred Boar (striped beefsteak).
I grew out 5 seedlings, not being sure if the Barcelona plum was OP or not, and sure enough, the F1 seedlings were all different so it was a hybrid. All about 1/3 bigger than the striped plum, all striped, 3 round and 2 plum-shaped.
The best part - one of them was the best tomato I've ever tasted. #4 seedling (pic with long tress) was a great balance of acid-sweet and then a super sweet finish, almost as if the layer directly under the skin was sugar saturated. I usually don't like sweet tomatoes, but this was superb. #4 was also hyper productive and produced really long tresses. I'll be growing out this one for sure.
Also, I'm new to tomato breeding so feel free to correct my verbiage or assumptions.
