UNITED STATES. Louisiana Purchase Exposition. St. Louis, MO. 1904. Nickel so-called dollar. 20.29 gm. 34 mm. Bearded bust right; MALLEABLE NICKEL FIRST PRODUCED IN 1865 BY JOSEPH WARTON Sc.D. L.L.D. / INTERNATIONAL NICKEL COMPANY 1904.... HK 323. Mint State.