USAF Air Force Northrop Grumman B-2 Stealth Bomber 9-11 - ERROR COIN - RARE. Condition is new. This coin was made in remembrance of the 9-11 victims and to celebrate the hero’s of that day of tragedy. There was a limited run of these coins and they were all numbered. However, there were several prototype coins that had errors so they didn’t make the cut. This is one of those coins. On one side of the coin where it should say “AIR FORCE” it says “AIF FORCE”. It is a beautiful coin and the photos really do not do it justice. Feel free to ask any questions you may have. Coin comes in a protective case. Shipped with USPS First Class.