Mortar & Pestle, Type 2, Waterbury, Connecticut, Rohloff O-6, very fine strike ties 1867 1c grilled ultramarine to locally-addressed cover, postmarked with "Waterbury CT / Jun / 19" c.d.s., with enclosure dated the prior day, back flap largely removed, adhesive with the odd toned perf, else a very fine example of this rare cancellation, Weill Brothers "R.H.W. Co." backstamp, illustrated in Rohloff (fig. 211).