This is the biggest I have gotten yet. It is one pound, 6.5 ounces, and as ugly a tomato as I have seen that wasn't rotten.
It is a volunteer and this type has been showing up the last few years. They are very soft when ripe, with green tops. They have distinct lobes, which ripen one by one, and often have what looks like scar tissue dividing the lobes.
Unfortunately, my camera can't get a clear enough picture of the scale to show the weight, so it will have to remain of unverified weight, so not eligible to win the prize. :-(