(San Luis Obispo) San Luis Obispo, Cal., Aug 18 (1852). Bold neat manuscript postmark (SAL-1970) with pen cancels on 6¢ green Nesbitt entire with damaged 3¢ dull red and 1¢ blue, to Washington, D.C., Very Fine, only 3 covers for early 1850's, then nothing until 1866. Estimate  $200 - 300. $0 (Image)