21 Most Valuable Stamps: Rare Stamps Wanted By Collectors
luxe.digital › lifestyle › sceneJun 07, 2022 · The Baden 9 Kreuzer stamp should have been printed in pink color, but somehow green ink slipped in which was intended for use on 6 Kreuzer stamps, creating one of the most valuable rare stamps wanted by collectors. Only one unused copy and four used copies are known to exist. The last one sold in 2008 for $1,500,000, equivalent to $2,014,200 today.