Ran across this one:
eBay Auction -- Item Number: 330578369520
I know Lloyd quite well and he is a stand-up guy. For an original machine, not a bad deal. A set of knobs is probably available (I assure you Atari didn't make their own "custom" stuff, they were still busy etching Syzygy on everything).
Tube in the TV looks dim but not unusable. Might need tubes. I have never actually worked on an Atari Pong monitor, come to think of it; they've all been hacks or aftermarkets...
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