You probably already did it in your initial contact with him Noel, but I would think the thing that would make it stand out and make him change it - tell him a PC05 doesn't connect to a PDP8, it goes with something completely different (a PDP11 ofc, correct?).
Given that the title says its for a pdp8 (it isn't if it's a PC05).... I bet the seller would lose a 'not as advertised' battle pretty quickly. J
