This is an old coin that has been squashed out of shape.
I think this might be a George III half penny that is dated 1771 but there has been a hole drilled through it.
Not sure the reason for this, never seen an antique coin like this before and 2 turn up in the same old collection with the Medieval jettons I just listed. ( I have seen the modern souvenir pennies " rolled " in museums but nothing quite like this before. )
I can see it has a STOP after the Rev. wording. There are some straight line digs in both sides of the coin as well, so it has been circulated before someone has made it oval.
My coins are just as I have got them in from other collectors. They may be grubby as I do NOT clean them. They are just as they come in so sometimes I take more photographs at angles to show the coin better which can make them look slightly darker or lighter.