Zwartsluis Netherlands Holland Nederland 1673 Priorato engraved city planSwartesluys. (Europe, Low Countries, Netherlands, Overijssel, Zwartsluis, City Plan, Fortifications) Published 1673, Vienna by Michael Thurnmayer. Engraved by Gualdo Priorato. Fine late 17th century folio engraved plan of this Dutch city. One of the most interesting aspects of the plan is the clear delineation of the early fortified walls which still enclosed the city in the 17th century. The various early entrances through gates into are clearly