1945-1p2x, 1945 U.S. National Christmas Seals, Imperforate Proof Sheet of 100 seals, pm "E", F, NG. Issued 1945 by the National Tuberculosis Association (NTA). Designed by Park Phipps. Image of a boy carrying a wreath. Firm paper, fresh, never folded, shipped flat.
Sheet of 100 (10x10) seals. Colors: yellow, blue, black, and red. Seal size: 17x23mm. 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.