Wells Fargo & Co. Express, Phoenix, A.T., Jan 28, 1891 (Maricopa), purple oval date stamp (Meyer 19, rarity 9) on 1887, 2¢ green entire to Mexico City, Mexico, with green Mexican company frank at top, purple "Wells, Fargo & Co., El Paso, Texas, Jan 30, 1891" oval transit date stamp, receiving backstamp, Very Fine and choice, only six recorded examples of this Phoenix date stamp and the only usage to Mexico. Estimate  $750 - 1,000. $0 (Image)