AGW= 0.100 of an ounce. Limited mintage coin issued by the Isle of Man in 1990. This gold proof commemorates the 150th Anniversary of the Penny Black postage stamp. Shown on the reverse is the said stamp, depicting Queen Victoria. Her great-great Granddaughter, and current monarch, Queen Elizabeth II is shown on the obverse. Cataloged in Krause as KM#1427.