Found these two early silver milled coins today george ii sixpence and george iii shilling they need a clean so will post better pictures when cleaned.
What great coins @Pete.pete , personally I would not do that if you are not keeping them because there is a cachet in someone else "improving" them. They look pretty solid to me unless you mean soak them in water. I love the dark tones of these coins and so many 1787 shillings are cleaned to hell and back.
Yes there still dirt stuck on them I have but them in some distilled water will use a soft brush to clean . But you are right the patina dose look great .
I've only ever dug two, myself. A 1738 halfpenny on a colonial site here in Georgia, and a 1730 farthing in Essex, when I did my England dig trip in 2013. I also dug a 1782 contemporary counterfeit Irish Hibernia halfpenny of George III here in Georgia, on another colonial site.
Believe it or not, I found two of the three at the same time almost. One is a 1753 and the other is a 1754. They were found with about 2-3 inches on the ground of snow. The were literally about a few inches down on bedrock or some kind of rock. . The other, is a 1733.
If the counterstamp is nice and even and in a oval or rectangle it could be a merchant or private bank to guarantee the quality of Silver as there was a shortage at this time. A potential candidate could be Milinthorpe Bank in Westmorland/Cumbria. Did you find it "up North"? If it is crudely stamped it could be a love token or family keepsake. Unless you were fairly well to do in 1787 a Shilling was a lot of money. A Soldier earned " a Shilling a day".