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This is a medieval silver Halfpenny of King John struck at the London mint between 1199 - 1216 AD.
Obverse: hЄNRICVS | RЄX "King Henry" Legend around crowned facing portrait, with sceptre in right hand.
Reverse: RICARD.T.ON.LVND "Ricard.T. of London"
This coin started life as a penny, but it was necessitated in trade to chop the coins into smaller fractional denominations as halfpennies and farthings. These coins were legal tender and a halfpenny was simply a penny cut in half, whilst farthings (four things) were divided into four parts.
CULTURE: Medieval England
DATE: 1199 - 1216 AD
SIZE: 18mm x 9mm
WEIGHT: 0.72 grams
ATTRIBUTION: Spink 1350B
PROVENANCE: Formerly in a private collection, in Cambridgeshire.