California Penny Post Co., San Francisco, 5c Blue (34L4). Red crayon "X", added to a yellow cover with 10c Green, Ty. V (35) tied by "San Francisco Cal. Jul. 26, 1860" circular datestamp, which is about five years too late for this California post, still a Very Fine and rare stamp, ex Kapiloff
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E. 1,000-1,500