Each is a 1" litho marked on the curl only "Made In U.S.A." Each is identified with red or blue text. This set features jet aircraft of the 1950s and was issued in that era. Includes such famous planes as the "Bell X-1A," in which Chuck Yeager set many records beginning in 1953. This button has extremely faint vertical rub mark above the text but this is quite small and overall the set displays essentially N. Mint to Mint. Complete set of 12. From the Hake Collection and comes with Hake's COA.