Lot
510 
(Carrington) Cova & Co., Panama, oval agent handstamp in black on 1851 folded letter to Carrington in San Francisco, docketed "Augt 3/51, pr California (Adams & Co.)" at left, Very Fine, this being one of two known examples of the Cova & Co. oval handstamp in black, normally struck in red.Estimate $200 - 300.
Realized: $350