Technical Help identify this seat back

I bought this seat back at a local swap meet but only have one I need your help identify what it came out of. All the ones I find on eBay have less holes and the bead rolls are different. It has a large indent on bottom of back. Would like to find another to build a set for my 32 Chevy sedan thank you for your time

 

It says 30s Chevy but I see different when I look them up

 

I had a pair of these that I personally removed from a 1936 Chevy two door sedan. They had a wood base and they would fold for back seat entrance. They look a lot different with upholstery on them.

 

Here it is sitting in my old '55 Chevy.

 

Yours does look slightly different now that I compare the two.

 

That's what I'm stomped