1940-1px, 1940 U.S. National Christmas Charity Seals, Imperforate Proof Sheet, reverse of sheet

1940-2pxB U.S. Christmas Seals

1940-2pxB, 1940 U.S. National Christmas Charity Seals, Imperforate Proof Sheet

1940-2pxB U.S. Christmas Seals
1940-1px, U.S. Christmas Seals