Technical Clearly not a 33 chevy rear seat

I inherited a project 1933 Chevy Master 4 door sedan, which is coming along nicely and I have her running and driving. This seat frame was installed in the rear and at 41" wide it fits but the back it too tall. I found 2017 Explorer 3rd row seats fit perfectly. I won't throw away any vintage part, but I have spent hours trying to Identify this seat, I appreciate your help. The only stamps I can find are on the clips MSW 6.

Seat back 41" at widest and 23" tall
Bottom 41" by 20 deep"
Bottom is flat (no driveshaft tunnel)