This set is entitled "The Atomic Age: Tomorrowland 1955-1961". The entire set consisted of 10 pins, which inludes the large oversize main pin (Pinpics #12840), a title pin, and 8 pins that were also part of the 1998 attraction series, Flying Saucers, Spaceman K-7, Skyway, Phantom Boats, Viewliner, Autopia, Submarine Voyage, and Astrojets. The difference is that all the pins in the LE sets are individually numbered XXX/750. The regular edition size was 750 sets, but there were also 75 Artist's Proof Sets, and 15 "Printer's Proof" sets.This set is marked "PP 5/15" denoting the 5th "Printer's Proof" out of 15 Printer's Proof sets. See 13264 for the released set.