Reprints are also known, as in this example:

Quote:
Officially issued Christmas Seal Reprints have been printed -- and are normally collected -- in sheets of ten seals. They have been officially issued by the Danish Christmas Seal Fund (under the sponsorship of H.K.H. Kronprinsesse Mary) which is in charge of all matters relating to the Danish national TB / Christmas seals. The front of the sheet indicates the year of reprinting, in Danish, such as "Nytryk 1976". The back of each seal also bears the year of reprinting, in English, such as "Reprint 1976". The reprinting started in 1976 and still continues every year, normally with old two years reprinted in each new year. This been done from the 1904 issue so far up into the 1970s. When reprints have sold out, they have been re-reprinted in a new year along with the two normally scheduled reprints.
More information here:
http://www.jaysmith.com/Lists/Denma...40-1959.html