1946-1px, 1946 U.S. National Christmas Seals, Imperforate Proof Sheet, pm "E", F, No Gum. Issued 1946 by the National Tuberculosis Association(NTA). Designed by Mary Louise Estes. Image of a lamplighter. Firm paper, fresh, never folded, shipped flat.
Sheet of 100 (10x10) seals" 4 Portrait seals, and 96 regular seals. Colors: olive, black, red, and plue. 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.