Valor1939,
Welcome to Treasure Net !
There are three variations of that 1778 8R MX coin; two concern the assayer's initials and the third is a counterstamped date of 1778 over 1777. The counterstamp should be obvious if the coin is in descent shape. The assayer's initials are next to the mint mark, as you approach the 'noon' position on the coin. If you can read the assayer's initials (either FF or FM) let us know.
Don........