(Routes 4813 & 4829) Express Mail and Passenger Steamer Imperial, embossed green corner card on yellow cover from the Carroll Hoy correspondence to New Orleans La., endorsed "B/L", entered mails with New Orleans "Steam 6" circular rating handstamp; small top edge tear and flap torn, usual filing holes, otherwise Very Fine, a rare corner card. Milgram No. 639  Estimate $750 - 1,000. This cover was carried on the route after the end of the contract periods. $0 (Image)