Gustav Holm was a Danish navigator and polar explorer who mapped much of the east coast of Greenland. In the process he discovered several Inuit communities and great ice fiords. The high values of the definitive issue of 1950-1960 depict a polar exploration vessel named after him with an iceberg in the background.
This unusual example of the 1 krone brown definitive is postmarked St. John's, Newfoundland in Canada. Was it mistakenly placed in a Canadian mail box by someone from fishing boat or other ship calling into St. John's? Did it pass through the Canadian postal system unnoticed or was appropriate postage due applied? Unfortunately, there is no way to tell because the stamp was removed from its cover.
"Gustav Frederik Holm." Wikipedia. 25 Oct. 2008. Wikimedia Foundation, Inc. Web.
2 Oct. 2010 http://en.wikipedia.org/wiki/Gustav_Frederik_Holm.