Dutch tug Droogdok built at Zwijndrecht, Netherlands in 1913 according to the Dutch magazine Scheepvaart dated 31 December 1913

A list of the ships launched in 1913 reported the Dutch tug Droogdok with a tonnage of 20 Dutch inland tons by Gebr. Kooijman, Zwijndrecht, Netherlands for Droogdok Mij., Surabaya, Dutch East Indies.