Dammit, ya went and activated some dormant brain cells.
That case is the delux version with Leatherett artificial leather covering the pressboard standard case.
If it's still on line, there is a Utube conversion of a Kinnescope of an old RG&E (power company) promo for their free inhalator service to the general public.
The company bought 2 units after a lineman got zapped and kept one in their downtown office.
If somebody called for oxygen, 2 of their suits with Basic First Aid cards carried the unit down to a waiting car, tied a green pennant to the radio antenna and drove to where the oxygen was needed. They actually made about 20 runs a year, probably mostly Cardiac and drownings.
Now that you activated my brain, I gotta hunt up my NOS Scott case and see what it was built to hold.
Pressboard was a real popular material in the 50s, it had been developed in WW-2 for cases as a way to convert wood scrap into a useful material. Basicly wood and cornstalk fiber with a pigmented varnish binder rendering it a damn tough cardboard.