Mexico, 1856, 4r red, Mexico, with 1856, 2r emerald on registered cover front to Vera Cruz, canceled by dotted lozenge handstamps with matching Mexico certification boxed handstamp (Schatzkes 826 & 837), first month of issue dated August 20, 1856; front missing a stamp, F.-V.F., one of the earliest known postage stamp usages; with 1981 MEPSI certificate. Scott No. 4+3b  Estimate $400 - 600. $0 (Image)