Mexico 1861, 4r black on yellow, half used as 2r, Zacatecas. In combination with 1861, 1r black on green on folded letter sheet to San Luis, tied by straight line Zacatecas handstamp (Schatzkes 1849); light cover file folds not affecting stamp, Very Fine, a rare bisect combination usage, approximately 10 covers with a bisect and full stamp combination exist; with 2008 MEPSI certificate. Scott No. 9a+7  Estimate $2,000 - 3,000. $0 (Image)