The fragment, positioned on the east side of the lane near its junction with St Anthony's Place, measures just fourteen centimetres high and ten centimetres wide, barely larger than a paperback book. What makes it worth a second glance is what it once was, and what it quietly preserves about the built fabric of an earlier town.

The stone is most likely a fragment of a window sill, and its surface carries punch dressing, a technique involving repeated blows from a pointed tool to create a textured, worked finish that was common in the sixteenth and seventeenth centuries. More telling still is a small projection surviving at the base of the stone, the remnant of a mullion support. A mullion is the vertical dividing element between lights in a window, and this stub indicates that the original window was a multi-light opening of the kind typical in Galway's late medieval and early modern architecture. The city was once dense with merchant townhouses and ecclesiastical buildings featuring exactly this style of stone fenestration, many of them demolished or absorbed into later construction over the centuries. This fragment, reused as ordinary building material at some point in the past, is a trace of one such structure, its origin now unknown.

The fragment sits in the wall at street level, easy to pass without noticing. Court Lane is a narrow thoroughfare, and the stone is identified only by its worked face and that small projecting stub, details that reward a slow look rather than a passing glance.