Osaka Expo USA Sister Cities Pin Badges Set of 2 pin badges from the Osaka Expo American Pavilion. This is a valuable set of two pin badges, not for sale, that were distributed only to the staff of the American Pavilion at the Osaka-Kansai Expo! The price is set for the set, but there is a chance it may be sold out if the items are sold separately elsewhere, so please be aware of this.