Untitled Document 1970, Isle of Man (British Dependency), Elizabeth II. Cu-Ni Crown Coin. Mint Year: 1970 Reference: KM-18. Denomination: Crown - Manx Cat Material: Copper-Nickel Diameter: 38.5mm Weight: 28.25gm The Manx cat (/ˈmæŋks/, in earlier times often spelled Manks) is a breed of domestic cat (Felis catus) originating on the Isle of Man, with a naturally occurring mutation ...