what's an 11/75?

[Jay West]

I've been offered two 11/75's. I can't seem to find information on them. Are 
these Qbus machines, micro11 stuff? Or are they the bigger unibus stuff. 
Typically deskside towers or rackmount boxes?

They are model # 173QA-B2

I've googled and can't find a picture either :\

Depending on what else is in the load, I may take it. If nothing piques my 
interest I'll pass it on to the list.

Jay