Progressive Proofs (PCPs)

U.S. Christmas Seals, PCP Progressive Color Proofs Collection, 1930-53

27-3pcp, WX41, 1927 U.S. National Christmas Seals, PCPs, four (4) stages

27-3pcp, WX41, 1927 U.S. National Christmas Seals, PCPs, four (4) stages, ph

28-1pcp2, WX44, 1928 U.S. National Christmas Seals, PCPs, seven (7) stages

29-2pcp1, WX50, 1929 U.S. Christmas Seals, PCPs, three (3) stages

30-4pcp, WX55, 1930 U.S. National Christmas Seals, PCPs, four (4) stages

31-1Bpcp, WX61, 1931 U.S. National Christmas Seals, PCPs, seven (7) stages

32-1Bpcp, WX92, 1932 U.S. National Christmas Seals, PCPs, 7 stages

33-1pcp, WX68, 1933 U.S. National Christmas Seals, PCPs, 7 stages

34-1pcp, WX72, 1934 U.S. National Christmas Seals, PCPs, 7 stages

35-1pcp, WX76, 1935 U.S. National Christmas Seals, PCPs, 7 stages