I'll admit it: I'm a secret stamp-collector. Especially limited edition series such as the US postal service's Pioneers of American Industrial Design, which has 12 important designers from the '30s to '50s. On sale in July. [USPS via Core77] More »

Read more: http://feeds.gawker.com/~r/gizmodo/full/~3/Yiv1rZZOr2M/philatelists-with-secret-design-fetishes-should-keep-an-eye-out-for-these-stamps