>The tag shows 1 mm2 wires (which seems to be true) and a max. current of 16A.

Ahh! There is nothing wrong with the rating. It just doesn't mention that it's valid only when the cord is submerged in water. [Linked Image]

Seriously: A 1.0 mm2 cord is good for 13A under ideal conditions. In many cases, 6A is closer to the truth.