(Stamp Collar) Neostyle Duplicator. Large red advertising collar in the form of a perforated stamp with numeral "4" in the corners & printed "Awards at the Columbian World's Fair", collar franked with 2¢ Bureau issue (tiny perf flaws) tied by "Boston" flag machine cancel, small cover crease in top right corner cancel, Very Fine, a lovely item. Estimate  $100 - 150. $0 (Image)