In 1976, the Royal National Rose Society featured 4 different stamps of which millions were printed. Three of the 13p “Sweet Briar” examples had their value left out – i.e. the 13p does not appear on the stamp. This error was actually discovered before the stamps were issued, and all the copies should have been destroyed, but were not. Two of these stamps are in Queen Elizabeth II’s stamp collection and the third one has recently sold for £85.000.
Some of the most valuable stamps started off as big mistakes. This is the case for the Roses Error stamp released in 1978.
Three of these were incorrectly printed with the 13p price missing.
The Queen owns two and the third is estimated to be worth £130,000