25-1x, WX35, 1925 U.S. Christmas Seals Sheet, Type 1, F, No Gum. Sheet has never been folded, shipped flat. May be reinforced.
Issued 1925 by the National Tuberculosis Association (NTA). Designed by Robert G. Eberhard. Image of two (2) candles with holly. Typographed by Eureka Specialty Printing Co. Sheet of 100 (10x10), SE4S, green, red, and pale green. Seal Size: 18x24mm, perf. 121/2, no gum.
Christmas Seals are also known as TB Charity Seals, and are usually classified as Charity Seals, or Cinderella Stamps.