Shadbolt "Travellers Outfitters", advertising cover bearing 10¢ green (E7) and 2¢ Washington tied by two strikes of "Detroit Mich Jul 27 1911" duplex on cover to Philadelphia Pa., pink "Special Delivery" straightline, purple "Fee claimed at office of first / address Philadelphia, Pa." two-line handstamp, Philadelphia (7.28) arrival backstamp, Very Fine. Estimate  $200 - 300. $0 (Image)