I am still pretty happy with my identification of the three-masted yacht Dordrecht as Pieter Gorcum's ship. My primary sources on this subject are The First Dutch War and Geschiedenis van het Nederlandsche Zeewezen. A table on page 762 of Vol. I confirms that the ship was in service in March 1653 (because the Dordrecht was the only 17-gun yacht used by Zeeland). From The First Dutch War, in the narrative from Witte de With's journal, leading up to the Battle of the Kentish Knock, we know that Pieter Gorcum commanded a Zeeland yacht. The other Zeeland yacht we know about was the Gloeyenden Oven (14 guns) commanded in 1652 by Adriaan Janszoon den Oven. On page 765, another table is derived form the "Staet van Oorlogh te water voor den jahre 1654", and gives the information for the Dordrecht. What I had not previously noticed is that the crew was 50 sailors. The length we already knew was 85 feet (Amsterdam feet of 283mm), measured from stem-to-sternpost.
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