Liberia, 1880, 6¢ Violet, Plate Study, consisting of over 270 stamps; many multiples including two blocks of 15, block of 9, three blocks of 6, and 4 blocks of 4, includes diagrams of the 15 transfer types, double print, cracked plate, printing on ruled paper, some 1916 surcharges including double transfer, etc., F.-V.F. overall. Scott No. 18; $1,350+  Estimate $300 - 400. $0 (Image)