Update: did some research, this was a Zilog System 8000 tower from around 1982 - tape drive + hard drive standard, could run up to 8 terminals and ran UNIX variants like Xenix. A very early 16 bit workhorse.
I got back in touch with the owner, unfortunately when it didn't sell on trademe it made it's way to landfill.
So if you see expensive hardware which doesn't sell, do anything you can to stay in touch with the seller when it disappears off the site.
I wish I'd emailed sooner.
Wanted - Dead or Alive - Reward $$$: Compaq Deskpro 8088 / 286 / 386 - IBM RT 6150/6151 parts - AT&T 3B2 partsVC Twitter