A 7, 5¢ blue vertical left sheet margin pair tied by CHARLESTON S.C. MAR 31 cds on cover to Charles E. Baker, Yorkville, S. C., with green Lockwood & Johnston, Iron Founders, Builders of Steam Engines, Mill Work, Boilers &c. Charleston, S.C. cameo corner card on back flap; minor staining, Very Fine, a rare ad not listed in CSA Catalog, Ex Baum. Click to see front of cover. $400.