Hertfordshire

From an article in the St Albans Observer by Claire Ling:

A rare coin that was made in St Albans 2,000 years ago is expected to fetch up to £1,300 when it goes up for auction in London. The Iron Age coin was struck in Verulamium [sic] between 10BC and 25 BC and horse-riding Celtic warriors are depicted.

* Verlamiom = Pre-Roman Verulamium