1910, Colonel Ignacio Warnes, 5c green and black, center is inverted and shifted to the bottom left, imperforated block of four, top right stamp with a spot of gum loss, otherwise full OG, NH, VF (Image)

Air Post stamps. 1930, Lloyd Aereo-Zeppelin, inverted black surcharges, complete set of three, post office fresh, full OG, NH, F/VF and rare, only 100 sets with inverted surcharges were produced, C.v. $1,025 as hinged (Image)