(1898 Trans-Mississippi and International Exposition) Exposition Sta., Omaha, Nebr., Sep 23, 98. Sharp full strike of duplex postmark (Bomar O98-01) on 1¢ Official Souvenir postal card showing multicolored Mines and Mining building scene, Very Fine and choice, an exceptional postmark strike. Estimate  $100 - 150. $0 (Image)