Costa Rica 1940 15c on 25c Orange Panamericana Surcharge Error MNH. Scott C55 var
Just 300 examples of the 15c on 25c orange were created. The overprint was accidentally applied to three panes of the Waterlow 25c Orange Cocos Island issue, instead of the issued 15c on 50c (the two issued stamps are also supplied for comparison). Owner's/expertizer's mark on all three.