Mexico, 1868, 50c blue on light pink, Color Error, Queretaro, perf'd, cons 12-68, Allende cancel (Schatzkes 1277A - 200 points), Very Fine, an exceedingly rare error of color and only appears on thick figure stamps with the 1869 overprint, This Being the Only Copy Recorded and Used From Any Sub-Office; with 1992 MEPSI certificate. Scott Nos. 69b  Estimate $2,000 - 3,000. $0 (Image)