1927-3pcp, WX41, 1927 U.S. National Christmas Seals, Progressive Color Proofs, perf. 121/2, full gum, wide margin on left, P3S, F, MNH.
A complete set of four (4) stages showing color plate separations and the final design.
Progressive Color Proofs are usually issued in sets to show colors separately and in combination.
Issued by the National Tuberculosis Association (NTA).
Christmas Seals are also known as TB Charity Seals, and are usually classified as Charity Seals, or Cinderella Stamps.