Carlos III?

Hi all.
could someone please take the time to id this silver coin for me. Any help and information about it will be appreciated.
It was found when metal detecting in the Stockport area UK, on one of my permissions.
It’s 21mm in diameter.
weight is 1.96g
Metal is silver.
I can just make out the letter S just to the right of the of the crown ( or what ever it may be called) and 1747 to the left of the crown.
There is no detail on the other side.
Attached are three Images. I have added contrast and level adjustments to try and bring out detail.

Please follow this procedure and somebody might help you

https://en.numista.com/forum/topic71935.html

Thank you. I’m on it now :)

Ive now edited the post with as much information as I can give. Hope this is OK now.

https://en.numista.com/catalogue/pieces28559.html
looks like this but would be serious underweight

Thank you. It’s now wafer thin. Could that account for the loss in weight?

Mostlikely

Thank you for your time and help. Much appreciated.