VERY FINE. THE BOUTON'S STAMP WITH MANUSCRIPT OVERPRINT IS THE FIRST SWARTS ISSUE AND IS EXTREMELY RARE. THERE ARE PERHAPS TEN COVERS EXTANT, DATED IN LATE JANUARY AND EARLY FEBRUARY 1849, SOON AFTER SWARTS' ACQUISITION OF BOUTON'S CITY DISPATCH POST.
In our cursory survey of auction sales and other sources, we counted eight 136L13 covers. Allowing for covers not known to us, it is unlikely that more than ten covers exist.