The first Apple computer - together with a letter signed by Apple Inc. CEO Steve Jobs to the original owner - will be sold at a London auction this month.
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.
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The first Apple-1 computers were priced at $US666.66 and were dispatched from Jobs' parents' house.
The auction house said the item is rare because all the components are still in their original box and came with a letter signed by Jobs.
It will be sold on November 23 and is expected to fetch up to STG150,000 ($A241,896).
