magenta datestamp with matching grids tying 1847 10c Black vertical bisect (2b) to mourning cover to Brooklyn, Connecticut, very fine, the only legitimate 1847 10c bisect from Hartford (a second example listed by Alexander was proven fake) and the  only 1847 10c bisect on a mourning cover, an extraordinary and beautiful cover, ex-Rust, Hawley, Boker, and Gross, 1987 Philatelic Foundation certificate