Here, the Gravenstein apple tree has borne many, many apples the size of that tomato. I don't think I've seen Gravensteins run this big before, and the baby Grimes Golden has huge apples on it as well. This spring was perfect for flowering, pollenation and frost...our last hard frost came after fruit had already set. Not always that lucky.
Alas, our tomatoes suck. Too much cool PNW summer, not enough heat. They are running slow to ripen. So I am virtually enjoying your tomato--thank you so much for sharing the pic.