Skûtsjesilen (Flat bottom barge sailing)

Amazing footage of flat bottom barge sailing (skûtsjesilen)  in the late 1960's province of Friesland (Netherlands), extracted from the Bert Haanstra documentary 'Stem van het water / The Voice of the Water'.
Nice detail: from 5:13 one of the beret wearing skippers is seen without his beret on and clearly visible is where the beret usually sits - very tanned face below, very white above.