San Francisco, Cal. (San Francisco) Ship Covers. Small lot of four stampless covers including red clamshell "Ship 6" with matching San Francisco cds (part cover only), 1863 cover to Virginia with "Ship 6" & San Francisco double circle postmark, two 1864 cover with San Francisco double circle postmark, one with "Due 6" & one with "Due 4" handstamp, F.-V.F. Estimate  $200 - 300. $0 (Image)