In 2006 Disney Released a Pin set based generally on The Disney Dollars created in 1987. It is a 3 piece set. Originating from Walt Disney World and they have also been seen at Disneyland. Each pin has an approximate size of 1.375" W x 0.625" H.
These were only available for trade through Disney Resort Cast Members and are not available for purchase. These Pins were released in 2005, 2006, and 2007 and they are "Official Pin Trading" pins.
They currently are found online on auction sites. You may also find them at The Disney Resorts, cast members (resort employees) or other pin traders may have them for trade. This pin was an open edition and did not have a limited number available.
The reverse of the pin states "Official Pin Trading", the year, ©DISNEY, CHINA., and "Hidden Mickey Pin # of 3". "#" indicating 1, 2, or 3 of 3.