1970-4px, 1970 U.S. National Christmas Seals, Imperforate Proof Sheet of 100 seals, pm "B", 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 1970 by the National Tuberculosis Association and Respiratory Disease Association (NTRDA). Designed by L. Gerald Snyder. Sheet of 100 different designs including toys, people, holiday decorations, and Christmas trees. Printed by Berlin Lithography 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.