UNITED STATES. Century of Progress. Colorado. Silver so-called dollar. 38.5 mm. 1933. A mining scene; USE SILVER TO RESTORE PROSPERITY below; CENTURY OF PROGRESS 1833 • WORLD'S FAIR • 1933 around / The state seal; TRADE MARK below; ✮✮✮ONE OUNCE OF PURE SILVER✮✮✮ around. HK 870. In NGC holder MEDAL MS 60. Lightly toned and attractive. A few light marks in upper part of photo are in slab plastic, not the piece.