1820: list of the people who worked at the Nieuwe Werk te Den Helder in 1820 with the surname Swart or Zwart :
Jacob Jansen Swart, 2e meesterknecht [second master hand], married
Jan Zwart Jacobsz, scheeptimmerl. 1e klasse, married, six children
Gerrit Zwart, leerling kantapper , single
Jan Swart, leerling kantapper, single
Mattheus Swart, bewaker, married, one child