Mexico, 1861, 4r black on yellow, diagonal bisect, San Luis Potosi, in combination with 1861, 1r black on green, on 1862 folded letter to Guadalajara, all tied by San Luis Potosi cds's (Schatzkes 1443), Very Fine and choice, less than 10 combinations are listed in the Schimmer census, ex Schwabe; signed Calves, with 2007 Jaretzky, 2008 Scheller and 2010 MEPSI certificates. Scott No. 9a+7  Estimate $2,000 - 3,000. $0 (Image)