1984-T4x, 1984 U.S. Christmas Seals, Test Design, Sheet/30, F, MNH. Shipped flat. Scan of sheet front.
Issued 1984 by the American Lung Association. Holiday themes, same as 1984-1x, with extra gift tags. Perf, 121/2, columns 2, 3, and 4, are replaced by an additional row of gift tags. Sheet of 30 (5x6), SE 3S, PM at right, no printer's mark.
Design experiment Christmas Seals, which began in 1979, are issued on a limited basis to help select the design of the following year's national issue. The nationally issued Christmas Seals from 1981 to date were selected from a previous design experiment.
Christmas Seals are also known as TB Charity Seals, and are usually classified as Charity Seals, or Cinderella Stamps.