The person who sent in this coin asked to remain anonymous. I was told that the coin was unearthed in Scotland some years since and passed down the family.
The coin is a groat of Robert II, who was King of Scotland from 1371 to 1390 and was the first of the Stewart dynasty. On the obverse there is a star at the base of the sceptre and there are trefoils within tressure. The inner legend on the reverse tells us that this groat was struck at the Edinburgh mint. In Coins of Scotland, Ireland and the Islands it is listed as number 5131.
Both sides have been struck off centre, especially the obverse and there are weak spots on both sides but the coin is otherwise in Fine condition. As it stands, I would price it at £80 to £100.