The hoard Zwartewaterland 2017 consisted mainly of so-called ‘plakken’, which were struck at Hasselt for the bishop of Utrecht, Frederick of Blankenheim. Combining data from both the hoard Zutphen 1958 and from accounts of the town of Deventer made it possible to date the encountered variant of this ‘plak’ and therefor establish the TPQ of Zwartewaterland 2017 to the year 1404.