Mexico, 1895, 1c blue, "Prueba" essay, o.g., very lightly hinged, well centered amid large margins, Very Fine. Scott No. 242E  Estimate $100 - 150. Designed as a sample of by Bradbury, Wilkinson & Co. for their bid on the production of the upcoming new 1899 issue, to be similar to the current 1c issue with the upper left test banner incorporated into the design. $0 (Image)