12c Plum on White entire, Die 40 (U93; UPSS 229). Size 21, knife 98, watermark 2, cancelled by "San Francisco Cal. Jul. 13" duplex datestamp and cancel, blue 1875 company double-circle datestamp, addressed to Sacramento Cal. and paying four-times the 3c rate, pencil docketing at left indicating conveyance of stock proxies, backflap tear, Very Fine and exceedingly scarce used example of this high-value entire, illustrated in a 1992 Linn's article by Richard B. Graham (article included), with 2004 A.P.S. certificate as the earliest documented use, UPSS value $500.00

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