(Mail Routes) Steam Mazatlan. Oval handstamp applied at San Francisco on inbound covers, postmarked "San Francisco, Cal./May 16, 1865" double circle and addressed to the Office of the P.M.S.Co. in San Francisco with black "10" due rate handstamp for the steamship rate, small flap fault, Very Fine and scarce. Estimate  $1,000 - 1,500. $0 (Image)