As I was demo'ing the old drawers from my kitchen, I found this sticker on the bottom of one of them:

https://picasaweb.google.com/1004633...62600246046802

The plywood is a true 1/4" and made of hardwoods. I did a Google search on Weldwood Plywood and found this brochure from 1944:

https://archive.org/details/Beautifu...oodPlywood1944

That's a blast from beyond my past!

I've already started to recycle the panels. Since I've got a bunch of grooves to cut in 3/4" stock for my kitchen doors, I made a zero clearance insert for my table saw. The extra blank in the photo will be used to make an insert for my dado blade.

https://picasaweb.google.com/1004633...63293154716578

The original metal insert uses a screw at the front and a "spring tab" at the rear to hold it secure to the table. I chose to drill and tap the rear ledge that the insert sits on and use screws to secure both the front and rear of the plywood insert(s). My table saw has a 3/8" ledge all around the insert opening so I don't expect any sag in the insert. If I notice any, I'll laminate another piece onto the bottom of it to stiffen it up.