Denver and Rio Grande Express, black frank (DEN-001) on 1887, 2¢ green entire to Whitinville, Mass., entered the U.S. mails with "Denver, Col., Oct 16, 90" duplex postmark canceling, Oct. 15 docketing at left and notation "Hurried & crowded with business, telegram secure date" at top, receiving backstamp, Extremely Fine, without question one of the finest known Denver and Rio Grande Express franked entires, with only ten recorded usages of this frank. Scott No. U311  Estimate $500 - 750. The Denver and Rio Grande Railroad ran this express service as part of their rail service over the railroad lines throughout Colorado, New Mexico, Utah and Wyoming. $0 (Image)