16-1.6, WX18c, 1916 U.S. National Christmas Seals Block of 25, FV, full gum, MNH. Issued by the American National Red Cross. Designed by Thomas M. Cleland. Image of Santa, Red and green, perf. 12 1/2, bottom quarter of sheet.
This is the bottom right block of 25, seals 56..100. With missing perf pins between seals 78 and 79, 78 and 88, 99 and 100. Plus vertical red plate scratch between seals 57 and 97.
Christmas Seals are also known as TB Charity Seals, and are usually classified as Charity Seals, or Cinderella Stamps.