California Penny Post Co./San Francisco. Black circular company handstamp on 1855 cover to San Francisco with boxed "Penny-Postage Paid, 7." & "To the Penny Post Co." printed frank, franked with 1851 3¢ dull red and tied by part strike of 2nd cds; minor edge wear, Very Fine and very rare, company only existed for one year, ex-Knapp. Scott No. 34LU11+11A  Estimate $2,000 - 3,000. $0 (Image)