1851 12c Gray Black Diagonal Bisect (17a)

1851 12c Gray Black Diagonal Bisect (17a)

Top left diagonal half tied by two strikes of the Aug 1st (1853) San Francisco, Cal. postmark on cover to Boston, ms. Pr Steamer Northerner Augt 1st 1853. Faint impression of what appears to have been a penciled “due 10” marking at top, horizontal crease at top through cover and stamp, still neat and very fine cover Ex. Caspary where it realized $290.00, with Philatelic Foundation certificate (1956). Scott retail $2,500.00