San Francisco, Cal., 80, June 1 (San Francisco), red integral rate cds (SAF-270, R6) with matching straight line "Paid" handstamp on 1850 homemade cover to Middletown, Con.; small cover edge tears, F.-V.F., a very scarce integral rate postmark used between April and October of 1850. Estimate  $200 - 300. $0 (Image)