"San Francisco June 20, 1849".
Dateline on folded letter to Mazatlan, Mexico,
manuscript "Paid 25"
(cents) for double 12-1/2c intra-West Coast rate applied at the San Francisco post office in its distinctive magenta ink of the period, carried on the PMSC Panama
on June 20, offloaded at San Blas, an intermediate stop on the way to Panama, entered the Mexican mails with bold strike of red "San Blas" in script framed handstamp,
red "2" Mexican due handstamp, manuscript "P Steamer"
at top and "Julio 10"
(July 10) receipt docketing at bottom, Very Fine, the June 20 PMSC sailing was also the first to carry the new straightline postmarks from San Francisco, this is an extremely rare West Coast cover and early use from San Francisco
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