This coin (15mm in diameter) was unearthed from Yorkshire soil a couple of weeks since. The finder, Alex Hilton, asked for a full ID and a valuation.
The coin is a Calais halfpenny of Henry VI, which was struck during the annulet coinage. On the obverse there is an annulet either side of the king’s neck. On the reverse there is an annulet in two quarters and the legend reads VIL LA CAL IS, with double saltire stops after LA and IS.
This halfpenny looks to be in about VF condition so it shouldn’t be worth any less than £50 to a collector.