Post by nospamif it's one of the clear plastic ones, then it's definitely worth a lot.
A portable with clear plastics?
I don't know what the thread starter names as "portable". But if it's 33
years old, it would be a Mac SE/30 or the actual Apple Macintosh
Portable, with a 9,8" 640x480 monochrome LCD, 1 MB of RAM and a 40 MB
hard drive, which was introduced at USD 6500.
Yeah, this might be a real collectors' item.
The Portable also came without HD - but there still might be replacement
around for this drive, since it was SCSI.
The Lead Acid Battery might still be ok after all those years.
Personally, I still keep my first Mac, a Classic.
Oh, and a "clear plastic" might have been the iMacs from 1998, although
they where translucent only - or do you refer to the Mac 512k with
clear sides?
<http://vintagemacmuseum.com/collection/rare-items/>
This one would be really rare.