St. Louis, Mo. Exposition Sta./Sep. 1, 1904. Duplex cancel (Bomar type STL04-01) on unfranked World's Fair commemorative card and handstamped "Held for Postage", 1902 1¢ Regular Issue (defect) added and tied by "Sep. 5, 1904" duplex cancel of St. Louis, card additionally struck by magenta two line handstamp, "This is the mail for which you sent postage.", Very Fine and unusual. Estimate  $100 - 150. $0 (Image)