1930 (Sept 5): Airmail 1 s. sepia & olive, overprint in carmine on Harrison printing, a fine unused example with variety "Overprint Inverted", fresh and of very fine colour, superb large part og. An exceptional example of an extremely rare stamp, with just one sheet of 40 subjects printed thus. Signed Herbert Bloch, Sanabria, SG/NY. Cert. Ceremuga (2018) Gi = £ 15'000. (Image 1) (Image 2) (Image 3) (Image)