A leaden anchor-stock found off Porth Felen at the tip of the Llŷn peninsula in 1974 is described. So far unique in British waters, the stock is of a Mediterranean pattern obsolete by the time of the Roman conquest of Wales. From its decoration it may be assigned to the late second century B.C., or possibly a little later. The typology of ancient anchors is considered, and the reasons which may have brought a small Mediterranean craft to that spot are reviewed. The stock is now in the National Museum of Wales.