In 1879, the US Mint struck Morgan dollars with two distinct reverses, one with a flatter breast and flat feather atop the arrows (Reverse of 1878 or Second Reverse) and another with a rounder breast and a slanted feather atop the arrows (Reverse of 1879 or Third Reverse). The 1879-S Reverse of 1879 is an extremely common coin in all circulated grades and well into the Gem range, with even MS67s showing up with regular frequency. Amazingly, this piece is available in MS68 and even higher grades though is considerably rare at that level. PLs and DMPLs are reasonably common through MS66 and MS65, respectively, and then becomes much more challenging in grades above that range.