Rare Apple-1 computer on display

An Apple-1 Personal Computer is displayed at Christie's on Oct. 9, 2012, in London, England. Introduced in July 1976, the Apple-1 was sold without a casing, power supply, keyboard or monitor and buyers would have to supply their own. This rare personal computer has come from the estate of Joe Copson, a former Apple employee. The Apple-1 machine was designed and each model hand-built by Steve Wozniak. His friend Steve Jobs suggested a number of improvements, and handled its sale and marketing. When offered at auction in Christie's sale of Travel, Science and Natural History, it is expected to fetch between $80,000 and $130,000.

A photocopy of the original Apple-1 Personal Computer manual signed by Apple co-founder Steve Wozniak is displayed at Christie's on Oct. 9, 2012, in London, England.

An Apple-1 Personal Computer is displayed at Christie's on Oct. 9, 2012, in London, England.

A modern iPhone takes a photograph of an Apple-1 Personal Computer at Christie's on Oct. 9, 2012, in London, England.

An Apple-1 Personal Computer is displayed at Christie's on Oct. 9, 2012, in London, England.

A modern iPhone takes a photograph of an Apple-1 Personal Computer at Christie's on Oct. 9, 2012, in London, England.

A Cassette Interface for an Apple-1 Personal Computer is displayed at Christie's on Oct. 9, 2012, in London, England.

A modern iPhone takes a photograph of an Apple-1 Personal Computer at Christie's on Oct. 9, 2012, in London, England.