Known as the Apple 1, it was one of the first Apple computers ever built.
It sold Monday for $387,750 at a Christie's online-only auction. Bolaffi, an Italian collections company, said it bought the computer. The seller was a retired school psychologist from Sacramento, Calif.
Vintage Apple products have become a hot item since Steve Jobs' death in October 2011. Jobs joined forces with Steve Wozniak to build computer prototypes in a California garage, and Wozniak built the Apple 1.
Another Apple 1 was sold in May for a record $671,400 by a German auction house. It broke a record of $640,000 set in November.
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