folded letter internally datelined "Savanay Jouly the 23 1780", written by an English seaman on leave in Savanah, sent by private ship to Portsmouth, England where it received a two-line "Portsmouth Ship-Lre" handstamp, from there carried overland to London and its destination in Dunbar, Scotland, address panel faded and some light wear, still fine, British forces occupied Savannah from December 29, 1778 to June 11, 1782, during which time Americans blockaded the harbor with privateers and navy ships