Clinker-built seems to have been popular in northern Europe, I suppose I could look it up though... uh... Wikipedia has the date wrong, by centuries, considering this example. Unless there are alt- versions of sewn boats of course.
Generally, an awl or drill was used to cut matching holes from the inside of the hull to the edge of each plank, then the cord ran through these in succession, with caulk, and wood expansion (and cord contraction) from exposure to seawater, keeping the seam tight.
The Brittanica page uses this boat as its example, which is either awkward for them, or it means there’s been more than one boat found there. The planking on this one (I went to the PLOS-one paper and blew up the graphic a bit) is vertical rather than bow to stern.
https://www.britannica.com/technology/clinker-construction
The date may be particular to classification, whether applying the term, “clinker” to be confined to metal fasteners joining the planking versus sewing.
The hulls are light and strong, but an absolute bear to fix. The one with which I’m most familiar being the Nordic “folkboat.”