First three pictures are courtesy of ngc’s photovision plus. Unless it’s on state quarters, the ideal side for a missing layer is the obverse and this one has just that. Missing the entire surface is ideal as well opposed to a partial missing layer. This coin comes in at 4.6 grams and is certified by ngc and graded just shy of Unc at au58. Couldn’t find any other 82 Denver quarters missing a clad layer.