WF 22, 1886 10c Lilac Numeral envelope, 15c Frank, two strikes of purple oval July 1, 1887 La Paz company handstamp, addressed to Mexico City and endorsed "Via Guaymas, Benson, El Paso", as described in Schimmer and Heath's Mexican Maritime Mail (page 291) this cover was sent across the Gulf of California from La Paz to Guaymas, then by Ferrocarril Occidental Mexicano (Eastern Railroad) to Benson, Arizona Territory, by Southern Pacific Railroad to El Paso, Texas, and finally by Mexican Central Railroad to Mexico City where it was received on July 9, a very fine cover representing an unusual route