Sweden Three Skilling Banco, Yellow Color Error, 1855
The three skilling stamp (yellow color error) was issued in Sweden in 1855. Due to a printing error, this stamp is printed on yellow colored paper (meant for the eight skilling stamp of the same set) instead of the usual green color (used for the three skilling stamp). One copy of the yellow error variety of this stamp was found in 1885 by a young Swedish boy in his grandfather's collection.
It is a one-of -a- kind rarity, as no other copies have been discovered to date. In 1996 the stamp was sold to an anonymous collector for $2.3 million at auction.