Governor's Island (Castle Williams), N.Y.
Buff cover from prisoner to St. Lawrence N.C., endorsed "Prisoner of War Letter",
pencil "Ex" examiner's mark, 3c Rose (65) with choice centering, tied by "New-York Jun. 23" (1862) double-circle datestamp, "Petersburg Va. Jul. 17" circular datestamp covers the examiner's mark, matching "10" due handstamp for C.S.A. postage, slight wear and minor edge faults, still Very Fine, a scarce cover sent by flag-of-truce via Petersburg during the brief period when prisoners and mail were exchanged at Aiken's Landing Va., the New York Harbor Governor's Island prisons -- Castle Williams for enlisted men and Fort Columbus for officers -- were first used in August 1861, southbound mail entered the U.S. mails at nearby New York City, and the C.S.A. mails at Norfolk or Petersburg, while six covers are known from the via Norfolk period, we are aware of only this cover from the via Petersburg period,
it apparently did not reopen in mid-1863 since no mail has been identified from the via Richmond period, with 1979 C.S.A. certificate, illustrated in Special Routes
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