1976-2px, 1976 U.S. Christmas TB Seals, Imperforate Sheet of 54 seals, pm "F", full gum, F, MNH. Fresh, firm paper, vibrant colors, never folded, shipped flat. Scan is an example. Full scan of front and back available upon request.
Issued 1976 by the American Lung Association (ALA). Designed by Robert V. Hungerford and Alan Mardon. Image of a Christmas landscape with Santa, sleigh, and reindeers riding through the sky. Printed by Fleming-Potter Company
Imperforate sheets have no perforations or rouletting at all.
Christmas Seals are also known as TB Charity Seals, and are usually classified as Charity Seals, or Cinderella Stamps.