24-2x, WX32, 1924 U.S. Christmas Seals Sheet, full gum, F, NH. There is slight perforation break between seal #50 and seal #60. Never folded, shipped flat. Scan of front and back.
Issued 1924 by the National Tuberculosis Association. Designed by George V. Curtis. Image of an Angel. Offset by Strobridge Lithographing Co. Sheet of 100 (10x10), SE4S, blue red, and yellow. Seal size: 18x24mm, perf. 121/2. Flaws indicate printing by Edwards and Deutsch Litho.
Christmas Seals are also known as TB Charity Seals, and are usually classified as Charity Seals, or Cinderella Stamps.