Uniontown. H.B., Cal. (Humboldt). (H.B. = Humboldt Bay) with manuscript date "Nov 12, '56", large blue oval postmark (Williams HUM-4870) on brown cover to Yuba City, Cal., matching blue oval handstamp with "Paid" inside and manuscript "3" at right, tears in flap of little consequence, Very Fine and scarce. Estimate  $300 - 400. $0 (Image)