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The Apple-1 from 1976 which is for sale via Christie’s online.

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Only a quarter of the approximately 200 original machines are thought still to exist. In 1977 Apple encouraged buyers to trade in the computer for the next model at a discount, and destroyed many of the recovered Apple-1s.

Christie's expect the Apple-1, which comes with a rare first manual, to fetch between £300,000 and £500,000.

The Apple-1 was designed and hand-built by Steve Wozniak, who co-founded Apple with Steve Jobs. The two are portrayed in Steve Jobs, a new film by Danny Boyle released in November.

The Apple-1 appears in Christie's 'Seven Centuries of Science' online timed sale from October 15-29.