Two weeks ago I sold prototype #13 for $20,000.00. It sold in less than a week, I had two solid back up offers along with someone who tried to snipe the deal by offering me more money. About five days ago another guy surfaced wanting the new owner's information, I assume so he could buy it from him at a premium.
I hate leaving money on the table but it would seem I underpriced it. - Meh, I'm the original owner and got to enjoy it all of these years.
Note: Illinois Pinball prototype