On May 27, 2006, the tenth US International Philatelic Exhibition opened at the Washington Convention Center in Washington, DC. Officially named Washington Philatelic Exhibition Inc., its most often referred to as Washington 2006.
The show included 640 exhibits from 60 countries. The “Best in Show” award went to Edward Grabowski for his exhibit on Guadeloupe Postal History. The grand prix award for best in show from the host country (America) went to William H. Gross for his US Classics: 1847 thru 1869 and their classic Re-Issues.