The "Flagship" sale of United States stamps #660

24¢ green & violet, double grill variety (120 var.), unused without gum, choice example of this rarely offered double grill variety, a brilliant fresh example with exquisite color, unlisted in Scott specialized catalog as a double grill in unused condition, a normal grilled example currently catalogs for $2,800.00 in Scott, so an unused double grilled example should catalog for about twice that; perf tips "cut straight" at right and bottom margins, Fine; 2013 Weiss certificate. Scott $2,200 for "used".