Danish West Indies, 1915, 5b-50b complete, in combination with U.S. 1¢-2¢ Wash-Frank issues on locally addressed cover, all tied by two strikes of "Christiansted, Saint Croix, Sep 17, 1917" duplex postmarks, fresh and Very Fine, a combination franking used during the 6 month transition period. Scott No. 51-58  Estimate $400 - 600. $0 (Image)