Currently at $500 on eBay, this Macintosh Portable prototype was supposedly “used by engineers to check for fit of internal components — nearly all plastic case components are clear plastic, including the handle and internal mounts for components.” Auction page. Click here for first picture in gallery.

This is the original Macintosh Portable, model 5120 which cost $7,300 when released in 1989. If you’re unfamiliar with clear case protos, there were usually about 10 (or less) of each model made during the design process.

[via eBay]

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