Lot
384 
(Town & County) Quartsburg, Mariposa Co., Cal., Nov 26, 1851 (Mariposa), manuscript postmark (MAR-1970) on buff cover to Bangor, Me., additional "10" rating at right; light edge wear and small central erosion hole, still Very Fine, the earliest known postmark from Quartsburg. Estimate $200 - 300.
The Quartsburg post office officially opened on October 7, 1851 although it already was in operation during the middle of that year. This postmark from a little over a month after the official opening is the earliest by far, with Williams recording a February 1853 manuscript postmark as the earliest.