A leaden anchor stock found by divers working off the Llyn Peninsula in 1974. It is the only one of its kind to have been discovered in British waters. It dates from the second or first century BC and provides valuable evidence of shipping around the coast of Wales before the Romans arrived in Britain. Judging by its size, it probably came from a relatively small boat, which may have been travelling from the Mediterranean to Cornwall to trade for tin, or perhaps Anglesey, where copper was mined. On one face are four mouldings representing a lucky throw in the game of knucklebones. This was a kind of magic, for the crew needed luck when casting the anchor, for it was never certain whether it would take hold in the seabed.