Thank you and agree but most curious about the two stampings both above an below pedal hole???Yep,
The first two types, starting in the late 1950’s, had a step where the pedal hole is.
The first generation had a decorative dust cap over the backside of the pedal hole, and a pronounced step on the front side.
The second generation did away with the dust cap on the back, but still retained the step.
The third generation did away with the step all together.
So, this one may be a third generation Crankset?
1962 at the earliest.