1921-3, WX29a, U.S. Christmas Seals Imperforate Block, Type 3, full gum, corner thin, VF, NH. Issued 1921 by the National Tuberculosis Association.
Designed by George V. Curtis. Image of Santa and chimney.
Block of nine (9) Christmas Seals from Pos. 38-50. Flaw on Seal #49 - a dent in the cross at top left. Typographed by Zeese-Wilkinson Co., Inc. Fresh and well centered. Corner thin.
This is Type 3 of the seal, red, green, and, blue, 19x19mm, imperforate. Scans of front and back provided upon request.
Christmas Seals are also known as TB Seals, and are usually classified as Charity Seals, or Cinderella Stamps.