USPS Forever Stamps A Flag for All Seasons Booklet of 20 Double-sided Booklet of 20 Forever Stamps (12 stamps on one side, 8 on the other) Each stamp 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. Forever stamps will also be equal to the one-ounce first class rate Issued in 2013 and no longer available for sale from USPS, but Forever valid for postage. Perfect for invitations, weddings, and general mail.