Canal Zone, 1904, 8¢ on 50c bister brown, block of four with left selvage, tied by "Pedro Miguel, C.Z., Nov 11 1906" duplex on legal size Isthmian Canal Commission office business cover to New York City, purple Cristobal (11.12) backstamp with Cristobal, C.Z. registry exchange label (FX-CZ1, cat. $500) affixed, magenta New York (11.18) arrival backstamp, F.-V.F. Scott No. 14  Estimate $200 - 300. The Cristobal C.Z. label was only used from Sept. 1906 to Dec. 1906. $0 (Image)