An original Apple 1 computer, hand-made by Steve Jobs and Steve Wozniak in Jobs' parents' garage, could bring $240,000 when it goes on auction, experts say.

Jobs and Wozniak designed the Apple 1 in 1976. Just 200 were made, the Web site Old Computers said, and about 50 are thought to survive.

Jobs and Wozniak sold Apple 1 computers for $666, but London auction house Christies says the one at auction, in its original packaging and with the garage's return address on a typed label, could sell for between $160,000 and $240,000, Britain's The Register reported.

Also included are the original manuals, a letter from Steve Jobs and an invoice dated 12/7/76.

The computer, which Christies describes as the first pre-assembled personal computer -- no soldering required -- will go under the hammer in London later this month.