(Ranches) Dobbin's Ranch PO, Yuba Co, Cal, April 11, 1852 (Yuba). Manuscript postmark (Williams Yub-510) with matching "10" on brown stampless cover to Erie, P., minor edge wear, Very Fine, a classic California rarity, open Oct 1851-May 1854 just 2 ½ years when its name was changed to Oregon House, 5 or 6 known. Estimate  $300 - 400. $0 (Image)