I can't believe how tough this ad is proving to find!! I have seen some ads over and over again but never the one your looking for...Hmm... I smell a conspiracy
I did notice a big stack of old National Geo's at work a while back, mostly from the early 70's, didnt give them much thought until I came across your journey. If I get a chance I'll try to thumb through them a little harder, in the mean time keep all the cool old ads comin guys
... Mike...