USPS Forever Postage Stamps Flags 100 Count (Seasons) Brand new. May or may not be sealed in plastic (post office sold these two different ways) USPS Forever Postage Stamps Flags 100 Count Forever stamps will always be valid for first class postage even if rates change 100 (one hundred) first class forever stamps Each of these four A Flag For All Seasons (Forever&reg;) stamps shows an American flag, viewed from below, flying from a pole at full staff against a background of trees that evoke one of the four seasons of the year.