It is a window jamb, the vertical side-piece of a window opening, and it came originally from Leggetsrath in County Kilkenny. On its own that would make it an ordinary enough fragment of salvaged medieval or early modern stonework. What makes it worth a second look is a detail cut into one of its faces: a roughly circular depression, tapering slightly from top to base, with a narrow channel running from it to the edge of the stone. This kind of cut feature, too deliberate to be accidental damage, suggests the stone had a secondary use or meaning that has since been lost.

The jamb itself is a modest object by any measure, standing just under thirty centimetres tall and roughly eighteen and a half centimetres wide. Its edge has been chamfered, meaning it was cut at an angle rather than left as a sharp corner, a finishing detail common in dressed stonework of the medieval and post-medieval periods. A bar-hole survives in that chamfer, traces of mortar still visible within it, showing where an iron window bar was once set. The circular depression on the face measures about eleven centimetres across at its widest point, tapering to just over eight centimetres, and is cut to a depth of two and a half centimetres. From it runs a channel fourteen centimetres long and two centimetres wide, leading to the stone's edge. Whether this hollow served as a socket, a drain, a mould, or something else entirely is not recorded. The fragment is catalogued in the Kilkenny depot as stone carving number KD038.