Is this pmd? There are what seem to be die cracks/chips in the usual areas(corners of memorial base) but major distortion and some kind of damage all over the reverse. Obverse seems to be ok.
i see a small crack on each corner, very common in the '80's, the rest is zinc rot, once you get a crack or break in the plating, the zinc underneath will start corroding an spreading causing the plating to lift creating those bubbles...
