2007-T1x, 2007 U.S. Christmas Seals, Test Design Sheet, R08-CSCS-4-07. Issued 2007 with images of Penguins and Gifts, with silver foil border.
Issued 2007 by the American Lung Association (ALA). Designed by Katie Atkinson. Sheet of 56 (8x7) without gift tags, margin on 4 sides, five (5) designs, self adhesive, serpentine die cut. Dated 2007 with "R08-CSCS-4-07" in bottom margin. Silver margin scans much darker than actual color.
Text on reverse of sheet: "100 Years of Christmas Seals ..."
These are test designs. Since 1979 the American Lung Association has issued test designs to determine the design of the national seal for the following year.
Christmas Seals are also known as TB Seals, and are usually classified as Charity Seals, or Cinderella Stamps.