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Rare Unused Vintage Heath Corporation 1982 H19 Printed Circuit Board 85-2553:
$149.99
This is a video board that has nothing on it!
These go towards the H19 and H-89 (and maybe some other systems, I really don't know)
Not sure how our collector friend got unused boards, but for the truly committed, you could piece it all together and build your own!
Fast shipping.