Christmas Seals have been called a "back of the book" collectable, as they are listed in the back of stamp catalogs. If that is so, then the following material related to Christmas Seal collecting might be called "back of the back of the book"

Milk Bottle Collars

1937 3.50

1938 3.50

1939 3.50

1940 with green inscription on right 3.50

1940 with red inscription on right 3.50

1941 3.50

1942 3.50

1943 carmine 3.50

1943 red 3.50

1944 3.50

1945 3.50

1946 blue 3.50

1946 grey blue 3.50

1947 3.50

1948 3.50

1949 3.50

1953 3.50

1954 3.50

1955 3.50

 

Christmas Seal Transit Passes - wanted