Countries using Imperial pounds and ounces:
USA, UK, Eire, South Africa, India, Canada, Australia and the some Commonwealth of Nations. coverted in poinds adn stonepounds
The Japanese 1 yen coin has a mass of one gram. (lighter than the British penny (3.56 g), the United States cent (2.5 g) or the "Euro-cent" (2.30 g)).
Wikipedia links covering units of mass show/hide