Mexico 1861, 8r black on red brown, 1/8 used as 1r, Tampico. Bottom left portion of stamp with large corner margin, tied on small piece by H. Matamoros boxed date stamp cancel (Schatzkes 1594), Extremely Fine, an extremely rare usage from Tampico; with 1996 MEPSI certificate. Scott No. 11 var.  Estimate $1,500 - 2,000. $0 (Image)