1918-3, WX23, 1918 U.S. Red Cross Christmas Seal, Type 3, full gum, VF, MNH. Issued 1918 by the American National Red Cross. Distributed by the National Tuberculosis Association (NTA). Designed by Charles A. Winter. Essay, with colors: red, green and brown; size: 201/2x23mm; perf. 121/2.
Christmas Seals are also known as TB Charity Seals, and are usually classified as Charity Seals, or Cinderella Stamps.