That's one of the tiniest Schuko plugs I've ever seen, so the black and green aren't really long. They're both the same length, maybe 2.5cm max, probably shorter.
Cutting the red would have been real hack work, the ground is supposed to be the same length as phase and neutral or even longer. Possible though.
Restripping is unlikely, there is a rubber collar on the cloth cord which looks original and non-removable. I think there are even indents from a different strain relief.
The plug definitely didn't look like professional work at all.
Yesterday I thoroughly cleaned the kettle and today we had several cups of tea from it at school.
I have no idea about the wattage since there is no nameplate.
That kettle was built to last!
I assume it's 1960ies, judging by the old cord.
Inside there's hardly anything that could break... that entire thing consists of plug, cord, connector and heating element.
The "old" kettle was a "Made in China" crap with automatic shutoff when the water boiled, dry-run protection, indicator light and whatever rubbish. Pretty soon the flimsy switch failed...
