Today Sotheby’s auctioned off one of the world’s last functioning Apple 1 motherboards for $374,500, more than double the high estimate—$180,000—that auction house had made for the early Apple computer.

Apple only made about 200 of its first computers, which sold in 1976 for $666.66. Each motherboard was assembled by hand by Steve Wozniak and the handful of original Apple employees, and did not include a monitor or keyboard. Sotheby’s estimated that only 50 Apple 1s survive, and only six are known to be in working condition.

The Apple 1 came with 8KB of RAM, and a MOS 6502 8-bit, 1MHz CPU. It also included the cassette interface, the operation manual for the Apple 1, as well as a preliminary Apple BASIC user manual, according to Tom’s Hardware. A similar Apple 1 was sold in 2010 for $213,600, but that unit came with the original invoice, so Sotheby’s estimated today’s motherboard would sell for less. They clearly underestimated the value of a relic from a company that has grown from a guy's garage to be one of the most powerful companies in the world.

The BBC reported that “Sotheby's said there was a battle between two parties for the item which also included the original manuals. A set of bids were executed by the auctioneer on behalf of an absentee collector, but a telephone bidder proved more persistent and eventually clinched the sale.”

Sotheby’s also auctioned off a four-page note hand-written by Steve Jobs when he was at Atari in 1974. The auction house estimated it would go for $15,000, but a buyer picked it up for $27,000 today. In it, Jobs discussed how to improve Atari’s World Cup soccer game, and ended the letter with a Buddhist mantra that translates as, "Going, going, going on beyond, always going on beyond, always becoming Buddha."

Sotheby’s has not revealed the identities of the winners of either auction.