The S/S Sperwer, a Dutch merchant ship with a crew of 64 on board was shipwrecked off the coast of Cheju-do. The surviving crew of 36 were stranded on the southern shore of Cheju-do in August 1651. They were interned in March 1656 under the jurisdiction of the "Pyongsa" (Commandant) in Pyongyong, Kangjin and the were instrumental in making clogs of their native country and sold them to people around the Pyongyong area to earn some extra money. Thus, Dutch sialors started the manufacturing of namakshin or rain-clogs on the Korean Peninsula. This clog has carved lines similar to decorations found on silk covered leather footwear in Korea. Childs clogs were decorated like this with red and green paint.