Certainly one of the Nuremburg Jetons or tokens. I can't make out the lettering but quite likely by Krauwinckel.
Although produced in Germany, these were used as counters across most of Europe and turn up a lot in Englannd. The theory is that they were used by market traders as tallies when totalling up a large purchase and so are found frequently at old market sites. Most date from the late 16th century.
Some of the scarcer designs are sought after and will sell. This one appears to be the most common design and I that condition is worth just a few pence.