Great Britain 1842 Guernsey Ship LetterGreat Britain 1842 Guernsey Ship Letter. Handstamps England Guernsey 1842 entire to London, rated "2 8" and showing, on reverse, fine Guernsey double arc date stamp (20. 4) and very fine step type "guernsey ship letter" (Type S. 4) with large part red arrival datestamp alongside. Almost certainly the finest known example of this very rare handstamp. A rare piece of early Channel Islands postal history. Provenance: Ex The Peter Stone Collection of