11-1, WX7, 1911 U.S. Red Cross Christmas TB Seal, Type 1, F, full gum, MNH. Designed by Anton Rudert. Issued 1911 by the American Red Cross. There were five types of 1911 Christmas TB Seals. This is the Type 1: end of house solid green with a heavy red circlular frame 22mm in diameter. P4S, perf. 12.
Christmas Seals are also known as TB Charity Seals, and are usually classified as Charity Seals, or Cinderella Stamps.