For comparison: here are the most common M/T spinners. The tapered edge is smaller than the Rader style. I've never actually seen the style of the one in the ad above, unless it said Rader.
I've found a few other nice vintage ads for more wheels that I will try to post later. It seems that 1965 was a boom year for the industry. New "mag" wheels came out of the woodwork everywhere!
Verne