Jack Nicklaus @ about 16
Teenage Jack is correct. The swing was in an HBO documentary about the 1960 US Open.
What surprised me the most was the first picture: didn't anyone tell Jack he needed to restrict his hips in the backswing? In fact, it looks like a good left-handed players follow-through!
Not a chance; his weight is actually on the outside of his right foot.
The first pic almost looks like a lefties follow thru
looks like arnie