Quoted from Blackbeard:What did the proto topper look like?
I believe it was just a lamp dome (like what is on a F14 or Highspeed).
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Good luck with your sale. If I was willing to take in an additional project and if it was local to me I would be your buyer. Many years ago NOS Space Station playfields were easy to come by. There was a Pinball Expo in the late 1980's or early 1990's that Williams brought out a big pallet of NOS Space Station playfields (along with Big Guns and maybe even F14 if I remember correctly) and sold them for $5 each. I bought a few of each back then.