90mm U.S. RCL cartridge case

[charley777]

Greetings to all
Recently acquired a U.S. M-112 case for the 90mm RCL anti-tank gun.
90x413R x98
Very light aluminium case with stencil as shown.
No headstamp because there is no base. This system used a rupture disc.... which presumably incorporated a primer.
I have almost no information on this.
Any image(s) of projectiles would be most welcome
The case is shown next to a 75x408R U.S. RCL case for comparison.

 

[Slick]

There's this: https://inetres.com/gp/military/infantry/antiarmor/M67.html

 

[HarryG]

Here is photos of the drill round