What's the rarest or most unusual computer-related item do you own?

Cray J932SE Original paper copies of Dvorak newsletters and software catalogs that came with my IMSAI 8080. Prices for Microsoft BASIC and all that. I'd imagine the paperwork is more rare than the system. There are color brochures for some other systems like vectorgraph as well. I should check to make sure they exist in scanned format in the wild. Apple IIGS that Wozniak autographed for me when he visited Virginia Beach. Yamaha C1 286-12 midi laptop. It doesn't work and most others I find are same situation. But more rare than the computer is I found a print copy of the service manual that even Yamaha doesn't have. It came with documentation that wasn't in the wild, so I set it free and it should answer questions for others. Would like to get hold of working unit eprom dumps. -- Ethan O'Toole