Jan Coenders' ship Graaf Willem

Jan Coenders did not command the 12-gun jacht Graaf Willem, but did command a fluit hired in Groningen in April 1653. That can be seen in Witte de With's journals. Ron van Maanen has the details of the Graaf Willem:

The fluit Graaf Willem, Capt. Jan Coenders

Length from stem to sternpost:  129ft
Beam:                            28ft
Hold:                            12ft
Height over hold:                 6-1/2ft

26 guns:
14-8pdr, 9-6pdr, 3-4pdr

Crew: 90 men

Sources:

1. Ron van Maanen, unpublished manuscript "Dutch Warships 1600-1800", undated but circa 1992
2. Witte de With, journals from 1652 to 1658, Archive E8812 from the Riksarkivet, Stockholm