2016-D Cumberland Gap Quarter PCGS MAC MS67 PQ DMPL 2nd Finest Registry Spotless. The slab is still in it’s original packaging since it arrived from the main seller. DMPL refers to a Deep Mirror Proof-Like coin. MAC takes up where CAC leaves off. MAC stickers spotless coins. “MAC sticker could enable you to increase the value of your coins above that stated market existing Price Guide.” Shipped with USPS First Class.