An Amish man with a nameless family farm was selling these at a farmers market. I was familiar with three of the four. the new one was the Stark Jumbo which turns out to be a real oddity. It can weigh over 2 lbs and be 160+ inches in diameter. It is a new variety that originates with Stark Bros Nurseries in Missouri. They have discontinued it already so if you want to grow them, you'll have to make cuttings form the few that already have. More here.