I did some hunting on the net, and oddly enough the only car I could find that matched your picture CJ was... wait for it.... THE HOLDEN!! Now I don't know if this is true, but it would match the time frame.
I tried to find a better picture but I couldn't. It looks the same to me, but i'm probably wrong. Take a look, what do you think.
Well I'm waiting for the picture to upload, I might have some pics for you.
Here they are, this is what I thought it looked like in your picture
425.jpg)

634.jpg)
But i'm probably wrong. I thought it looked like the picture. what does everyone else think, is it a Holden hood ornament?