It would appear to be a lead token of some description, possibly a metal detector find. It is quite large at just over 2cm, and is quite unusual in its design. I wonder whether it is the sort of thing purchased at a mediaeval shrine on a pilgrimage, one side could easily be a representation of a rood screen and the other perhaps an aisle or arch with figure representations. Certainly not a typical lead farm/trade token.
Do you have any idea of how it was found? It won’t be of much value, but if you have any provenance you could show it to your local Finds Liaison Officer.
Jerry