The first Apple computer - along with a letter signed by Apple Inc. CEO Steve Jobs to the original owner - will be sold at a London auction on Nov. 23.
Described by Christie's as a "historic relic," the Apple-1 was introduced in 1976 and sold without a casing, power supply, keyboard or monitor.
But it was the first personal computer with a fully assembled motherboard, at a time when personal computers were sold as self-assembly kits.
It is expected to fetch as much as $242,400.
The first Apple-1 computers were priced at $666.66.