This coin was sent in by Paul Marland, who had tentatively identified it as a halfpenny of Henry VI. However, he asked if I could provide more information.
This is a halfpenny of Henry VI, which was struck during the pinecone mascle coinage. On the obverse the legend reads +hEnRIC REX AnGL. There is a pinecone before REX and a mascle after it.
On the reverse the legend reads VIL LA CALI SIE, so the coin was struck at Calais. There is a mascle after LA and a pinecone after SIE. In the Standard Catalogue halfpennies of this type are listed as number 1885.
This halfpenny is a reasonably decent example of the type but it isn’t particularly scarce; nevertheless, to a collector it shouldn’t be worth any less than £60.