>>106984557
There's a transparent plastic under the leather on both sides, those broke, but they don't do anything important, they guide the sliding motion of the headband in a centered way. Without them it still slides just fine, just moves a bit side to side when sliding, but that's irrelevant, functionally. The black plastic connection between the leather and frame is fine no issues.

>>106985041
Ah so all K712 are made in EU. I remembered something about manufacturing being moved somewhere but didn't remember all the details.