Apple co-founders Steve Jobs and Steve Wozniak hand-built only 200 Apple 1 computers in 1976 - and one of the few remaining and functioning models has just sold for $320,000 (£215,691) at a Christie’s auction.

The original Apple computer consisted only of a green motherboard attached to a piece of wood. It didn't include a case, monitor, keyboard, transformer or switches. However, the mint condition model on auction came with an instruction manual, a markup of the computer's schematics and an autographed picture of Jobs and Wozniak.

Read: Apple I goes on auction at Christie's

A similar Apple 1 with different accessories sold in May for $640,000 through Auction Team Breker in Germany, while another one sold at Sotheby’s in 2012 for $374,500. That's a lot of money for a pair of old computers that originally sold for $666.66 each.

The auction at Christie's, which closed at 10am Eastern on Tuesday, included nine other Apple products such as a Macintosh SE with a translucent case and a 1983 Apple Lisa. Although the exclusively online auction fetched a large sum of money, the Apple 1 didn't reach the $500,000 (£741,800) estimate that many expected.

Christie's is the world's largest auction house with main headquarters in King Street, London, and in Rockefeller Plaza, New York. As part of online auctions, Christie's accepts bids via the Christie's website and iOS app on Apple's App Store.