This has been sitting on my desk for a few months, un-flipped. I wasn't sure why I set it there or if it was just because it was an 83 and in decent condition gleaned from pocket change. Then I took a closer look. Not sure if it was just dumb luck or if I subconsciously saw something slightly off with it.
Anyway, I flipped it and am keeping it even if it's just slightly rotated. I cropped to the edge of the flip for those who like to try to gauge the rotation angle.

