Mexico, 1872, 6c green, two singles + 15c red + 100c lilac, Saltillo. Cons 36-72, tied by Saltillo oval date stamp on 1872 registered cover front receipt to Mexico City, Certificado oval handstamp at edges and certified boxed date stamp at center; small flaws including 6c cut in when cover was receipted, Fine. Scott No. 93+95+98a  Estimate $500 - 750. $0 (Image)