A journalist wears her Olympic pins at the 2012 Summer Olympics, July 26, 2012, in London. Outside Westfield Mall, at the edge of the Olympic Park security zone, people set up shop to trade and sell pins from the 2012 games and Olympics past. (AP Photo/Ng Han Guan)

Ioannis Ioannidis, from Greece, displays some of his pin collection on his hat while speaking with people next to the Olympic Park, July 25, 2012. (AP Photo/Sergei Grits)

Pin collectors chat next to Olympic Park, July 25, 2012. Some erected small displays covered in velvet to showcase their wares. (AP Photo/Sergei Grits)

Collectors next to the Olympic Park, look to trade and sell pins from Olympics past and present, July 25, 2012. (AP Photo/Sergei Grits)

A customer checks out pins outside Westfield Mall, at the edge of the Olympic Park security zone, July 25, 2012. (AP Photo/Sergei Grits)

Tennis players Francesca Schiavone of Italy, left, laughs with Kim Clijsters of Belgium as they exchange pins at the All England Lawn Tennis Club at Wimbledon, July 26, 2012. (AP Photo/Elise Amendola)

Serena Williams receives a pin from a fan after a doubles match at the All England Lawn Tennis Club in Wimbledon, July 31, 2012. (AP Photo/Elise Amendola)

Timm Jamieson, from the United States, displays his pin collection next to Olympic Park, July 25, 2012. (AP Photo/Sergei Grits)

A pin collection from the London Games, displayed on the back of a jacket outside Olympic Park in London, July 25, 2012. (AP Photo/Sergei Grits)

A collection of Olympic pins are displayed by a pin trader outside the Olympic Park at the 2012 Summer Olympics, July 26, 2012, in London. (AP Photo/Charles Krupa)