United States, Maryland Stampless Covers, 1790-1868. 23 covers, variety of towns, rates & markings, including several straight line "BALT" usages with various rates, 1790 straight line "Baltimore. Feb 21" to Philadelphia; couple red "Sandy Spring" with Quaker datestamp; 1857 red straight line "Baltimore R.R." with integral "10cts" rate cds; beautiful 1868 "Baltimore Am. Pkt".exchange marking, "10" handstamp, double circle Brooks & Co., St. Jago de Cuba forwarder on front & double oval J.R. Marquette / Habana on reverse; condition generally F-VF, please inspect. Estimate  $350 - 500. $0