Dutch screw steam tug Rijswijk built at Dordrecht, Netherlands according to the Dutch newspaper De Dordrechtse Courant dated 26 August 1911

An item reported after the launching of the Bertha at the shipyard of Huiskens&van Dijk, Dordrecht, Netherlands was the keel laid down of the Dutch steel screw steam tug Rijswijk for account of A. Prins Thzn., Sliedrecht, Netherlands. The edition dated 14 October 1911 reported her launching the same day. The 150 ihp engine and boiler were made by the shipyard.