#1 & #2 Norwegian TB Christmas Seals reversed in most Catalogs

#1 1906 & #2 1907 Norwegian TB Christmas Seal tied on proving reversal of dates of issue.

#1 1906 smaller seal, Queen Maud

#2 1907 larger seal, Queen Maud

These were discovered to be reversed, with the larger seal being the first, issued in 1906, and the smaller 1907. This error seems to have originated in early European catalogues. The proof of the reversal was the dates of the seals tied on cover.