Silver Mountain, Cal. (Alpine). Double circle postmark on 1868 cover to London franked with 1861 10¢ green + 1861-66 2¢ black with pinwheel cancels & tied by red "New York Paid All" transit cds, red "London" arrival postmark at left, original enclosure included which is well written & full of Mining details, adhesives with small faults, Very Fine; a scarce town marking. Estimate  $150 - 200. $0 (Image)