unused U.S. Pan-American Postal Congress presentation booklet, 1926, small black leather booklet presented to delegates at the Mexico City Congress, cover with gold stamped U.S. P.O.D. emblem, containing 36 different U.S. stamps affixed to pages incl. nos. 551-573, 622, 623 and C4-C6, fine-very fine, Scott retail of the stamps $1,035.20