1974-2px, 1974 U.S. Christmas TB Seals, Imperforate Proof Sheet of 100 seals, pm "F", full gum, F, NH. Fresh, firm paper, vibrant colors, never folded, shipped flat. Scan is an example. Full scan of front and back available upon request.
Issued 1974 by the American Lung Association (ALA). Designed by Rubidoux. Four (4) designs alternate in the sheet: two (2) children on sled, dog and cat by Christmas tree, mailman, snowman and three (3) children. 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.