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Surface Preservation Scratches, bag marks, and contact marks affect grade. Luster Original mint shine increases value. Error Coins Doubled dies Off-center strikes Die cracks Clipped planchets Error varieties can dramatically increase value. Many collectors overlook modern coins. But modern high-grade coins are becoming increasingly competitive in the registry set market. Collectors compete for the highest graded examples. This pushes prices upward for top-population coins. The 2013-D