1990-1px1, 1990 U.S. National Christmas Seals, Imperforate Proof Sheet of 100 seals, pm "S", full gum, F, MNH. Firm paper, fresh, never folded, shipped flat. Scan is an example. Full scan of front and back available upon request.
Issued 1990 by the American Lung Association (ALA). Designed by Maureen Drdak-Jensen. Images of doves and poinsettias. Printed by Specialty Printers of America.
Imperforate sheet of 42 seals, SE 3S, gift tags in 4th column, ordinary dull paper, full gum.
Imperforate sheets have no perforations or rouletting at all.
Christmas Seals are also known as TB Charity Seals, and are usually classified as Charity Seals, or Cinderella Stamps.