Question about Datejust over-polishing...

[Southern]

This is my first post to this wonderful forum so go easy on me.

While looking at many vintage Datejust models for sale (mostly from 1970s and 1980s), I've noticed that they often have a slightly asymmetric appearance of the case. The sweeping curve that follows the curve of the bezel is usually intact on the side of the case away from the crown. However, on the side of the crown the curve appears flattened as if the curvature has been polished away.

Left side looks correct like a ( shape
Right side looks more flat like a > shape.

Hard to explain but I think you get the idea. I'm very picky, so it's noticeable to me. Is this what happens with over-polishing or was the Datejust case actually shaped like this back then?

Educate me please.