The item is claimed to be a prototype of the Macintosh 128k but with the 5.25-inch 'Twiggy' floppy disk drive, which featured in the Apple Lisa 1 computer announced in January 1983.
The Twiggy drive was originally intended to be standard in Apple machines but repeated failure rates prompted the company to switch to the 400k Sony 3.5-inch disk drive before the original Macintosh was released in January 1984.
In information alongside the eBay listing, the seller claims that only bits of Twiggy Drive Macs have surfaced previously, but this is the only complete model.
The computer comes with an original Apple keyboard from 1982-83, along with 128k Apple-branded mouse, power cord and pull-out card tray, all of which are said to be working condition.
This is all available at a starting price of $99,950. There are just over five days left for bids, although no-one has lodged an offer so far.
Discussing the condition of the product, the listing says: "Computer powers on, chimes, then the typical gray screen appears with a blinking question mark inside of a floppy disk icon appears, indicating to insert a boot disk. Keyboard and mouse have been tested on a standard Macintosh 128k computer and work perfectly."
However, it notes that because the seller does not have any Macintosh software on Twiggy disk, the computer does not actually boot.
As the seller has the user name 'Wozniac', it was initially reported in the media that it was Apple co-founder Steve Wozniak selling the item.
However, a note has now been posted on the eBay account saying: "I am not Steve Wozniak, nor am I attempting to impersonate him. My eBay ID is 'wozniac', not 'wozniak'.
"I have had this eBay ID since 2007. Also, I live in Canada. Steve Wozniak (co-founder of Apple, Inc.) lives in the USA. My sincere apologies to you Steve, if this listing causes you any problems."
The seller said that they also own a "complete Apple Lisa 1 computer with its original boxes and matching serial numbers", but did not indicate whether this was for sale.
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