CSA 12-KB, 10¢ deep blue (left sheet margin single with 4 huge margins) tied by scarcer black PETERSBURG VA FEB 21 (1865) circular datestamp on cover to Rev. Jno M. Pilcher, Tredegar Iron Works, Richmond, Virginia. Very late use. Tredegar Iron Works was the largest ironworks in the Confederacy and a major factor in locating the CSA capital in Richmond. Ex David Burton. $150.