Last week, an unidentified person bought an original and working Apple-1 computer for $355,500 at an auction at Christie’s New York City office. The Apple-1, Apple’s first computer, which debuted in 1976, kicked off what would eventually become the world’s most profitable company.

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Although there were similar computers on sale at the time from other manufacturers, the Apple-1 (AAPL) came with a pre-assembled motherboard, which “put Apple far ahead of its competitors,” according to Christie’s auction listing. A computer’s motherboard is essentially its brains that contain key technologies like a central processing unit (CPU) and memory chips that are necessary for the computer to function.

Apple co-founder Steve Wozniak said in his 2006 autobiography iWoz, that contrary to some popular accounts, the late Apple co-founder Steve Jobs did not help build Apple’s first computers. Instead, Wozniak claimed he alone engineered the Apple-1 while Jobs focused on selling them.

Christie’s auction house notes that roughly 50 Apple-1 computers still exist, with many being displayed at museums around the world, like the Smithsonian Museum of Art.

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In previous years, an Apple-1 sold at auction for as much as $905,000 and another for $671,400. The auction house did not say why this particular Apple-1 model sold for a lower price than others. However, tech publication AppleInsider speculates that those computers weren’t modified with extras like a green case and a different computer chip.