Premier made quite a few amps with cases that opened up, usually with the amp in one side with a speaker and a remote speaker in the other side.
Model 35 PA system

Model 76. This one breaks in half with
speakers in one and amp and speakers in the other.

I found another one on Ebay:

I bought a 76 case without the amp. Let me know if you have a chassis that you
want to sell - or I may just let my case go cheap.
This one is a Twin
88. Very strange configuration. It breaks in half like the 76 but it
has some kind of bizarre key arrangement to control tone. Here's pictures of
one:

Several of these have appeared lately on eBay:

Here's another Ebay auction.

