Free, W.M. Gwin, U.S. Senate. Congressional free frank on cover to Wilmington, Ohio, "Sacramento City, Cal., Sep 17, 1859" cds (Williams SAC-2560) and endorsed "Overland via Los Angeles" at top, cover tear at upper left, Very Fine. Estimate  $150 - 200. William M. Gwin, Senator from California during the 31-36th Congress, was an instrumental figure in setting up the Pony Express and regular overland mail services. $0 (Image)