Reference: KM-177.
Minted from 1705 to 1760
Weight: 3.18 gram of Silver
Diameter: 22 mm
Obverse: Crown above denomination in roman numeral (LXXX = 80), three large rosettes and two small rosettes in fields.
Legend: IOANNES . V . D . G . PORT . ET . ALG . REX
Reverse: Cross with rosettes in fields. Motto ("In this sign thou shalt conquer.")
Legend: Legend: * IN * HOC * SIGNO * VINCES *