When it was discovered in 1846, it had been built into a souterrain, an artificially constructed underground passage or chamber typically associated with early medieval ringforts, where it had been repurposed as structural material long after anyone had thought to read what was carved on it. It was not alone: five other ogham stones were found in the same souterrain, tucked into the south-western quadrant of a ringfort, making this one of the more concentrated clusters of early inscribed stones found anywhere in Ireland.

Ogham is the earliest form of writing used in Ireland, a system of notches and strokes cut along the edge or face of a stone, most commonly recording personal names and lineage in an archaic form of Irish. This stone, measuring 0.9 metres in length, carries an inscription along three of its angles. The scholar R.A.S. Macalister, writing in 1945, read it as CORBAGNI K[OI] M[A]Q[I] MOCCOI COROTANI, a formula meaning roughly "of Corbagnus, of the kin of Corotanus", the standard commemorative structure of ogham inscriptions. Damian McManus, revising the reading in 1991, rendered part of the text with greater caution, reflecting how weathering and damage can leave even expert readers uncertain of individual characters. The stone has since been subjected to three-dimensional digital scanning as part of the "Ogham in 3D" project run by the School of Celtic Studies at the Dublin Institute for Advanced Studies, an initiative that records these fragile carvings with a precision no earlier generation of scholars could manage.

The stone is currently on display at the museum in Ballyferriter, Baile an Fheirtéaraigh, as part of the National Museum of Ireland collection. Ballyferriter is a small village on the far western edge of the Dingle Peninsula, and the museum there holds material of considerable archaeological significance from the surrounding landscape, one of the most densely settled areas of early medieval Ireland. The stone itself is modest in size, but the inscription it carries connects a named individual to a specific kindred group, a small fragment of a social world that would otherwise be entirely invisible.