Chicago Supplementary Mail, Sep 29, blue cds ties 1¢ blue (63) and 2¢ black (73) on cover to Baltimore Md., matching "North Branch P.O." oval postmark, manuscript 1863 docketing at left, Very Fine. Skinner-Eno No. PM-SM 4. Estimate  $1,500 - 2,000. A REMARKABLE COMBINATION OF BOTH CHICAGO SUPPLEMENTARY MAIL AND NORTH BRANCH MARKINGS. $0 (Image)