1957-2p1x, 1957 U.S. Christmas TB Seals, Imperforate Proof Sheet of 100 seals, pm "D", F, No Gum. Firm paper, fresh, never folded, shipped flat. Scan is an example. Full scan of front and back available upon request.
Issued 1957 by the National Tuberculosis Association (NTA). Designed by Clinton Bradley. Four (4) seals designs of Santa and child in ornaments alternate in the sheet. Printed by Edwards and Deutsch Lithography Co.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.