Vintage Apple computer, 1976 model, auctioned off for $668,000

German auction house Breker has said one of Apple's first computers - a functioning 1976 model - has been sold for a record 516,000 euros ($668,000).

The auction house said an Asian client, who asked not to be named, bought the 'Apple 1', which the tech company's founders Steve Jobs and Steve Wozniak built in a family garage.

The Apple 1, which was sold for $666 in 1976, consisted of only the circuit board. A case, a keyboard and a screen had to be bought separately.

The auction house says the computer bears Wozniak's signature. An old business transaction letter from the late Jobs also was included.

Breker claims it is one of only six known remaining functioning models in the world. It already sold one last year for 492,000 euros.