Worldwide, Collection, 1840-1990. Two cartons with albums, the most interesting being a study of the myriad security methods used in the production of postage stamps to prevent reuse, neatly mounted on exhibition pages and with detailed descriptions; better known are the grills used on U.S. stamps; also the use of fugitive inks, various overprint schemes, production techniques, perfins, and many more; also in the lot are several albums and stockbooks filled with stamps; please inspect. Estimate  $250 - 350. $0