CSA 7-R, 5¢ blue pair (4 margins) used with rare manuscript cancel of “Post Oak Ark / Novr 8, 1862” on pristine folded letter to Thos J. S. Farr, Albany, Georgia from Isaac T. Robinson, who was the postmaster of Post Oak, Calhoun County, Arkansas, from July 16, 1860, to May 31. He is requesting payment of taxes owed. Rare Arkansas cancel, the ONLY LISTING FOR THIS TOWN in Dr. Bruce Roberts’ Arkansas census. Ex Clippert. $750.