Mexico 1915, 20c rose & blue, Villa Monogram overprint. Tied by "Mexico, D.F., 10. May. 15" duplex postmark on locally addressed cover front, Very Fine, an extremely rare and seldom seen usage of an original Zapatista stamp; with 2008 MEPSI certificate. Scott No. 445  Estimate $1,000 - 1,500. $0 (Image)