The stamp dates back to 1903 and features a misprinted picture of an upside-down Lake Taupō.
A US buyer purchased it at a Mowbray
Collectables auction. The last time it sold was in 1998, when it went to New Zealand Post for $125,000.
Lot 801 Mint Penny Black example. Photo / Mowbray Collectables
Lot 2 Coins and Medals: New Zealand Wars Medal 1845-46 to Joseph Lacey. Photo / Mowbray Collectables