Charleston S.C. Prison. Bold strike of "Port Royal S.C. Sep. 27, 1864" double-circle datestam (Image)

E. $ 400-500

Charleston S.C. Prison. Prisoner-of-war cover from an unidentified prison in Charleston S.C. (Image)

E. $ 500-750

Columbia S.C. Prison. Buff legal-size cover addressed to "Lt. Col. R.W. Martin Comdg. P (Image)

E. $ 400-500

Danville Va. (Building No. 4). Small inner cover, a folded letter datelined "Danville Va. (Image)

E. $ 750-1,000

Ligon's Tobacco Warehouse, Richmond Va. "Washington D.C. Nov. 17, 1861" circular datestamp an (Image)

E. $ 400-500

Salisbury Prison, N.C. Prisoner-of-war's homemade cover to North Somerville Mass., with origi (Image)

E. $ 750-1,000

Fort Delaware, Delaware City. Orange prisoner-of-war cover to the University of Virginia, Alb (Image)

E. $ 1,000-1,500

Fort Delaware, Delaware City. Bright buff cover to Lexington Ky., clear strike of "Prisoner's (Image)

E. $ 300-400

"Immortal 600" Morris Island. Cover and letter datelined "Fort Pulaski Ga. Nov. 15th 1864" (Image)

E. $ 750-1,000

Point Lookout Md. Beautiful clear strike of "Prisoner's Letter Examined" double-line octagona (Image)

E. $ 1,500-2,000

Point Lookout Md. Incoming prisoner-or-war cover, 10c Blue, Die B (12), deep rich colo (Image)

E. $ 400-500

Confederate Prison Balance. Two covers, first from Libby Prison in Richmond Va., endorsed (Image)

E. $ 400-500