HK-870, Colorado 'Century of Progress' Dollar, Type IV.  Sold to defer the cost of Colorado's representation at the 1933/34 CoP at Chicago.  As these were apparently all sold in the State rather than at the event, not listed in Shevlin's U. S. Exposition reference.  Choice Uncirculated, certified NGC MS-63.  A nice original specimen, unlike many that have been dipped (including some certified), with interesting toning, a deep gray with reddish highlights.