Pan. & San. Fran. S.S., Dec 23., perfect crisp strike on buff cover with circled "40" rate handstamp, addressed to Port Richmond on Staten Island, N.Y., light creasing, a Very Fine and choice strike of this rare marking, ex-Wiltsee, Pearce. Towle No. T-1-c  Estimate $750 - 1,000. This rare route agent marking was applied on board contract vessels between San Francisco and Panama. This was applied on board the Pacific Mail Steamship Co. steamer California when it stopped at Acapulco by U.S. Agent Bannister Midgett. $0 (Image)