1852-57 Railroad Postmarks. 6 covers & one front, all franked with #11's; including Eastern R.R., Northern R.R., Phila. and Baltimore R.R., Boston & Maine R.R. and A & St.L. & Androscogin & Kennebeck R.R. markings, few minor flaws, Fine or better group (no photo). Scott No. 11  Estimate $400 - 500. $0