1867 (Feb. 27) Guatemala to San Francisco Cal., datelined folded letter with partial strike of "Correos, Feb 27" cds at bottom, red "Franco" framed handstamp and reverse with black "1" reales rating handstamp for postage to port, entered U.S. mails with "San Francisco Cal. '10' Apr 2" integral due cds and matching "Steam Panama" oval handstamp; minor opening tear top right, Very Fine. Estimate  $750 - 1,000. A CHOICE "STEAM PANAMA" USE FROM CHILE TO SAN FRANCISCO CAL. The San Francisco "Steam Panama" marking was applied to non-contract mail entering the port to indicate transit origin. $0 (Image)