John Hammered Silver Penny. This silver penny was issued during the reign of King John (1199 - 1216).
When King Richard I died in 1199, the throne was passed on to his younger brother John.
John was the youngest child of 8 and never expected to be king. His father even nicknamed him "John Lackland" as it was unlikely he would ever inherit any noteworthy land.
John ruled England until 1216. All coins issued during his reign featured the text "HENRICVS" (Henry) from the reign of John's father, Henry II.
In 1205 England's coinage was overhauled, with new coins replacing the low-quality older versions. Unfortunately this did not last, as by the 1220's the craftsmanship had again deteriorated.
The coins are referred to as "short cross" as the reverse design features a small cross.