1947-1px, 1947 U.S. National Christmas Seals, Imperforate Proof Sheet, pm "E", F, No Gum. Issued 1947 by the National Tuberculosis Association (NTA). Designed by Raymond H. Lufkin. Image of a sled with oxen. Firm paper, fresh, never folded, shipped flat.
Sheet of 100 (10x10) seals. Colors: red, green, brown, and blue. Seal size: 22x17mm. Printed by Eureka Specialty Printing 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.