1918-2x3, WX22a, 1918 U.S. Red Cross Christmas Seals, Type 2, Booket Pane of 10 (2x5), PM at top, F, mint, NH. Perf. 121/2, Seal size: 183/4x23mm. With pamphlet given to those who became members in the "Christmas Roll Call." Scan of pamphlet and pane of ten seals.
Issued 1918 by the American National Red Cross. Designed by Charles A. Winter. To avoid competition with other fund drives in progress during WWI, the regular sale of seals was halted. Everyone who joined the Red Cross Role Call was given at least one pane of ten seals.
Christmas Seals are also known as TB Charity Seals, and are usually classified as Charity Seals, or Cinderella Stamps.