Oxfordshire. Black slug [sic] impaled on a thorn, a cure for warts. Donated by Thomas James Carter 1898.71.1
Here is an open-source map of Oxfordshire showing the principal settlements. It was obtained from:
which offers open-source maps which can be used without restriction.
(Our thanks to Nigel James of the Map room at the Bodleian Library for suggesting this source)
Please note that you can find maps showing the places that Pitt Rivers Museum's Oxfordshire collections come from here.