1888 Centennial Exposition of the Ohio Valley and Central States (Ohio). A wonderful balance lot including Expo. advertising, letterhead, Ad collars, Expo. corner cards, cancels, etc., better items include five cards/covers with "Expo. Station" duplex (Bomar C88-01, Cat $600, Seven recorded), 3 cards with "Expo. Station Rec'd" cds (Bomar C88-02, Cat $500, Six recorded), mixed condition, please inspect as many rare & valuable items are included. Estimate  $1,500 - 2,000. $0 (Image)