MNH or mint never hinged 1958 American Stamp Dealers Association or ASDA 10th National Postage Stamp Show Stamps or Cinderella souvenir labels, the Complete Se-Tenant set of 8. Celebrating the 40th anniversary of US airmail. As noted, all are mint never hinged. The show was held November 21-23, 1958, at the 71st Infantry Regiment Armory in New York City.