a ruling Sultan of Kilwa, but it is unclear whether the ruler was from the 10th century or the 14th century. A similar coin, also thought to be from the Medieval Kilwa sultanate was found in 2018 on Elcho Island, closer to the continent. Questionable interpretations Baghdad Battery: A ceramic vase, a copper tube, and an iron rod made in Parthian or Sassanid Persia. Fringe theorists have hypothesized that it may have been used as a galvanic cell for electroplating, though no electroplated artifacts from this era have been found. The "battery" strongly resembles another type of object with a known purpose – storage vessels for sacred scrolls from nearby Seleucia on the Tigris. Dorchester Pot: A metal pot claimed to have been blasted out of solid rock in 1852. Mainstream commentators identify it as a Victorian-era candlestick or pipe holder. Kingoodie artifact: An object resembling a corroded nail, said to have been encased in solid rock. It was handled a number of times before being reported and there are no photographs of it. Lake Winnipesaukee mystery stone: Originally thought to be a record of a treaty between tribes, subsequent analysis has called its authenticity into question. Sivatherium of Kish: An ornamental war chariot figurine discovered in the Sumerian ruins of Kish, in what is now central Iraq, in 1928. The figurine, dated to the Early Dynastic I period (2800–2750 BCE), depicts a quadrupedal mammal with branched horns, a nose ring, and a rope tied to the ring. Because of the shape of the horns, Edwin Colbert identified it in 1936 as a depiction of a late-surviving, possibly domesticated Sivatherium, a vaguely moose-like relative of the giraffe that lived in North Africa and India during the Pleistocene but was believed to have become extinct early in the Holocene extinction event. Henry Field and Berthold Laufer instead argued that it represented a captive Persian fallow deer and that the antlers had broken over the years. The missing antlers were found in the Field Museum's storeroom in 1977. After restoration in 1985, it was conclusively identified as a depiction of a Caspian red deer (Cervus elaphus maral). Tecaxic-Calixtlahuaca head: A terracotta offering head seemingly of Roman appearance found beneath three intact floors of a burial site in Mexico and dated between 1476 and 1510. There are disputed claims that its dating is older. Ancient Roman or Norse provenance has not been excluded.