What Year Chevy is this? Anyone Know?

Hi Guys. Last week I went out to an old house I lived in. No one has lived there since I moved out in 1977. The three vehicles I had were a 1960 Chevy, a 1962 Chevy and a 1947 Chevy. I was digging around in the brush and found this Center Cap burried. Way Down in the dirt of the old garage. Anyone know what it is from? I think it is from the 60's Any help is appreciated to Identify it.
Thanks

 

Nova rally wheel, 73/4?http://www.corvettespecialtiesinc.com/gallery.cfm?g=FF76A077-D558-FA60-5AA863FF27C13C0C