The London pound is that of the Hansa, as used in their various trading places. This is based on 16 tower ounces, each ounce divided as the tower ounce. It never became a legal standard in England; the use of this pound waxed and waned with the influence of the Hansa itself. A London pound was equal to 7,200 troy grains (16 tower ounces or, equivalently, 15 troy ounces).