The 1909-1910 2d rose and yellow-green is the only unused example of the postage due stamp in existence. This unique item was the part of John du Pont’s legendary stamp collection. After collector`s death in 2010, the unique 1909-1910 Australia 2d postage due was auctioned in the UK. Struck from Die II, it was offered without gum in fantastic condition. The item was sold by a London auction house for $13,587 on March 6, 2013.