The 2015-D, Blueridge Parkway quarter originally had grease (or Vitamin E ) on the surface. The mint used Vitamin E to separate the coins from sticking together in bags and to reduce either wear or damages, so I've heard. Up close, after the steam cleaner washed off the gunk, it's really neat how the first O in North Carolina is oblong, and the second "O" further south in Car"O" lina is doubled. I can work up close photos in this feed if you want to see them under a 25X powered microscope & 8.1 megapixel camera. If you like.
I think it of like a score. $ is the units, and the bigger the score, the better you're off. Watching the score go up over 30 years makes me appreciate the accrued interest rate, by which is like trying to rope a raging bull in a rodeo contest. There's winners, losers, and no changers. Just like a home grown stock market.