This 2019, self-adhesive coil stamp of Ireland is from the current, 9th definitive series (A History of Ireland in 100 Objects). The stamp depicts the upper half of a late 18th century, Penrose cut-glass decanter. The "N" inscription signifies that it is domestic rate postage.
From the 100objects.ie website, "The Penroses were representative of the more dynamic, entrepreneurial side of Anglo-Ireland. With roots in Cornwall, they moved to Ireland in 1685, by which time they may already have been Quakers. William Penrose established himself in Waterford in the early 18th century as a tanner, and his son also William, founded the Waterford Glass Factory in 1783."