Mexico, 1861, 8r green on red brown, Saltillo, in combination with 1861, 4c black on yellow, Saltillo on registered cover front to Catorce, tied by Saltillo oval date stamp (Schatzkes 1355), with matching 1863 certification boxed date stamp at top (Schatzkes 1352) and oval handstamps at corners (Schatzkes 1360); front corner repair at bottom right not affecting stamps, Very Fine, only 20 covers and fronts are known with the 8 reales green stamp, with 120 8 reales stamps sent to Saltillo; with 2015 MEPSI certificate. Scott Nos. 12+9  Estimate $6,000 - 8,000. A UNIQUE USAGE OF THE 1861 8R GREEN ON RED BROWN ISSUE FROM SALTILLO. $0 (Image)