Due to its shape and size, it seemed to the researchers a Bronze Age artifact, but the object turned out to be made of a copper-zinc-tin-lead alloy, typical of the Iron Age and later periods. The artifact proved to be a so-called plano-convex ingot — the first of its kind ever found in the country. The overall shape, size, and weight of the ingot strongly suggested that it could be a Bronze Age find. “Initially, we believed the Särdal ingot to date back to the Bronze Age,” the archaeologists said. Iron age metal trade between the Atlantic and the Baltic Sea: new insights from the first complete plano-convex ingot found in Sweden and ingot rods from the Iława Lakeland in northeastern Poland.