The product is a set of two blackened 1920P and 1929P Buffalo Head nickels, each with a denomination of 5 cents. These circulated coins are made of copper and were minted in Philadelphia. They are of business strike type, uncertified, and of variety Buffalo. The coins are a unique estate find that showcases the iconic Buffalo design from the early 20th century in the United States..  Unknown as to why the black coating is on them.  Have never seen this before.  Was something special?????  Had to clean a bit to see the good dates.  Check photos.  Thanks.