Update:

Suddenly these clips are available on Amazon (DE) for shipping to Switzerland.

Unfortunately, the 'nicer' clips marked with both centimeters and inches still won't ship here, but as long as you are happy with inches, marked in quarters, these are now available.

These clips are not as nice as my old hemming clips, they are a lighter metal and a tad sharper-edged, but what is there available today that is still the quality of yesteryear?

These will do in a pinch.