Iron concretion (secondary filled with rubber) originated around an iron object that itself was completely digested from the wreck of the East Indies sailor 't Vliegend Hart; which died in 1735. The concretion once revolved around a kind of round rod / rod or perhaps tube formed. The object could have been made of metal; wood; but also of fibers. A rubber molding has been made; Dutch East India Company; 't Vliegend Hart (ship); 1700 - 1735; rubber (material); concretionary stone; l 16.5 cm x h 12 cm x w 8 cm x d 2 cm