1912-1, WX10, 1912 U.S. Red Cross Christmas TB Seals, block of 4, F, No Gum. Only one type issued in 1912. Colors: red, green, and black. Seal Size: 22x22mm. Perf. 12. Lithographed by Strobridge Lithographing Co.
Issued 1912 by the American National Red Cross.
Christmas Seals are also known as TB Charity Seals, and are usually classified as Charity Seals, or Cinderella Stamps.