Item found in 1948 Cadillac Series 62

[zyrtecx]

I recently purchased a 1948 Cadillac Series 62 in the Cincinnati, Ohio area as a parts vehicle.
As I was cleaning out this vehicle I found under the front seat what appears to be some
type of maker, I have no idea what it is.
So what I'm asking donee anyone know what it is? (Photo attached)
Thanks for any help in advance!
Toby

[Steve Passmore]

If it's very thin tin with numbers punched in it looks like what I see a lot attached to the underside of seat springs by the manufacturer to denote what car and model the spring base is for.

[zyrtecx]

This piece is a over an inch thick and made like a brick, on the other side it looks like
it has been baked.

[Steve Passmore]

1" thick??    Not automotive at all I'll wager.