I bought one like it a few years ago. First thing I thought when I got it was how much did I pay for just two magazine pages.
Later, when I bought several magazines of the era, I got the same ad in some of them. Any motorcycle magazine from 1970 will probably have the same ad. You can probably buy single magazines and for less price you will get cool ads of Harley Davidson, Suzuki, Yamaha, Norton -with the hot chick- or even Hodaka.
Raul