(San Francico) Incoming 40¢ Rate Cover From London, 1850. With magenta "40 Cts" rate on 1850 cover, with "2/5½" rate (equal to 59¢, 19¢ + 40¢ trans-continental), black "Paid" in arc applied in San Francisco, Very Fine, a very scarce rate cover, ex Pearce, Walske. Estimate  $400 - 600. $0 (Image)