Unknown Hubcap center, Can you ID?

I thought I would throw this up for someone to identify, just for curiosity sake.
All I know is.. it was in the trunk of a rusted out 56 Plymouth Savoy.
I dont think it came from that car, but not sure, cannot find another
anywhere on the web. It has a nbr on the back PT - 2533048,
It is made of pot metal, it is not magnetic.
It has six bosses drilled for looks like 3/16 in screws on the back,
figure it must be part of a full hubcap.
Maybe someone has a need for it or at least has seen another one like it..
Could be it's not even part of a hubcap, I don't know.

 

It's a '65 Dodge

 

Yep, 302GMC it sure is,,
took me awhile to find it, how did you know? Did you find it on the web?
its an ot 65 Dodge Polara Monaco Hubcap Wheel Cover center,
I was hoping for something a little older,, oh well mystery solved.
I found it here:
http://www.collectorcarsforsale.com...heel-Cover-14-SPIN-For-Sale_110378197744.html