Chicago Ill, Jan 28 '64, blue cds duplexed with circular grid cancel ties 1¢ blue (63) and 2¢ black (73) on orange buff cover to Green Bay Wis., matching blue "West Branch P.O." oval postmark, Very Fine and choice. Estimate  $1,000 - 1,500. ONE OF TWO RECORDED 1¢ BLUE AND 2¢ BLACK JACK COMBINATION CHICAGO WEST BRANCH COVERS. Although branch post offices were authorized by law effective 7/1/1862, only Cleveland and Chicago had them. A 1¢ fee was charged until 7/1/1863, when carrier service was included in the general letter rate, for taking letters from a branch post office to the main post office where they entered the mails. Branch post office markings are scarce. $0 (Image)