British coin -Help identify please

minted in 1818 1 to 2 cm wide approx very thin 1 mm approx yellowish metal with serrated edge
GEORGE.III D.G.
BRITT. ....
Inscription on one side
MAL Y PENSE
HONI SOIT Q...
on other
thanks

Looks like a contemporary counterfeit of a post-Reform George III sixpence.
https://en.numista.com/catalogue/pieces13167.html

When you say contemporary counterfeit , how recent do you mean? Is it because it is very thin you think it is a counterfeit? It was found in a collection of coins all roughly 100 years old. Thank you

Quote: "Underwood"​When you say contemporary counterfeit , how recent do you mean? Is it because it is very thin you think it is a counterfeit? It was found in a collection of coins all roughly 100 years old. Thank you

​Oh, by contemporary I mean from the time the real coin circulated. My guess is that it was made back in the early-mid 19th century, and that it was once plated or dipped to resemble a real silver coin.

Great thanks you so much