(San Joaquin) Knight's Ferry, California, 14 Mch (1854). Crisp black straight line postmark (SAJ-1150), with manuscript "10" rate marking, to New Hampshire, backflap partly missing, Extremely Fine and choice, one of the truly outstanding California covers, less than 6 known; signed Robert Siegel. Estimate  $1,500 - 2,000. $0 (Image)