This was my grandparents main tomato, along with Old Buckeye, a big yellow with a massive core in it. They grew mainly these two for many years, 30's and 40's and on up into the late 60's.
Grandfather brought the Dinner Plate to W. KY. from Southern Indiana when they retired. He was a gardener for the state of Indiana for many years. His parents had grown it for as long as he could remember. I would guess we're talking the late 1880's or 90's.
I have grown Orange Oxheart since the early 70's. Crop failure last year left me with no seeds.
I'll find some somewhere, the coop can probably order me some.
Ken