Enright & Cos. Boise Cty. (Idaho) & S Boise. Paid, blue handstamped express company frank, also endorsed 'Favored by Oles of Oles Ferry', on buff cover wo Washoe Ferry, slightly reduced at left, small neat punch-hole clear of markings, still fresh and nearly very fine, rare, the only recorded example, this one may have been carried privately, but the express is believed to have operated ca. 1864 from Idaho City Idaho to the South Boise Mines, illustrated in Nathan