Buttonless Shoe, Waterbury, Connecticut, Rohloff O-13, full strike on 3c ultramarine, tied to cover by "Waterbury CT / Mar / 19" c.d.s., to Salem, Connecticut, large piece removed from back flap, 3cm tear at top of cover well clear of stamp, adhesive with natural straight edge and lower left corner crease, yet a crisp and very fine strike of this great Waterbury rarity, with the Crowe census reporting only three examples on cover, all postmarked on this date.