HK-20, SH 2-1 S, Official Medal of the 1876 U. S. Centennial Exposition at Philadephia.  An original, low grade problem free piece, obviously carried for many years as a pocket piece.  Difficult to believe as any Silver-dollar sized coin/medal typically picks up dings and dents along the way to achieving this degree of wear!  Certified NGC Fine-12, frankly I think a bit generous as I can see this better as a VG.  "Rare" in terms of the Condition Census, with only one example certified lower, which must be a doozie.  There is no such thing as "comps" for this piece, so I'm spitballing here as to price.  For those with a sense of humor. 

NGC 8900487-001