1966 Quarter Interesting Clip

Got this the other day, thought it quite revealing. Apparently the upset mill had a problem with the lack of material right at the edge, so the proto-rim didn't form across the cladding. Then, because of the lack of material, the mechanical force of the downward press forced the clad layers in two different directions at the clip, unusal for sure.

Physics of the downward stroke causes pressure, the equal reaction across the coin surfaces generally cause the more static clad layer(reverse) to "squirt upwards" along the collar edge, now notice the clip, just the opposite. I can't remember the calculus to figure out exact pressure movements, but this is, well, different. Here's pix of the coin and what a clad quarter looks like.