Currently, there are estimated to only be six working models of the original Apple 1 left, and one of them is going up for auction in Germany on May 25th. Computerworld
reports that it was originally purchased by one Fred Hatfield, who also received a letter signed by Steve Jobs offering an upgrade from the $666.66 Apple-1 to an Apple II 4K motherboard for another $400.
According to Mike Willegal, who has tracked down many Apple 1 computers, this particular one had an interface for a selectric printer grafted onto it.
The auction price for the computer is expected to land...