Vintage Hubcap

[605 Hoppy]

Picked up a Hubcap that looks like a 50' or 60's cap that I'd like to Identify. in the center of the cap it has the USA and South America with a bar through Central America. 10 inches across the front but a 7 3/4 Inch opening in the back. Fairly heavy for a cap. Any help would be appreciated.   

[Bleach]

Sounds like an Oldsmobile hubcap.

Need photos to nail down a year.

Edited October 28, 2017 by Bleach (see edit history)