This is a single 6 cent postage stamp similar to those shown in the image. These are NOT Forever stamps.
1968 US Commemorative Stamp Year Set MNH #1339-1364 F/VF — Huntington Stamp & Coin Shop
1343 - 1968 6c Law and Order - Mystic Stamp Company
Canal Zone postage stamps
962 3c Francis Scott Key Fine MNH on eBid United States
Sale 3065 The James Crumpacker Collection of Canal Zone Stamps and Postal History by H.R. Harmer - Issuu
US stamps 1944 #926
1343 - 1968 6c Law and Order - Mystic Stamp Company
Scott # 2723 - USPS Block Of 4 - Hank Williams - MNH - 1993 - Helia Beer Co
Daniel F. Kelleher Auctions, LLC Sale - 760 Page 191
The March Collector's Series Sale by Spink and Son - Issuu
H.R. Harmer, Inc. Sale - 3019 Page 31
US Stamps Value Scott Catalogue 325 - 1904 3c Louisiana Purchase Exposition