I own a 2019 calatrava which also feel hollow & loud running rotor .Therefore from the sound ,u cannot tell if fake or not without having real one to compare
If they can reproduce a watch has 80%-90match close to a 100 years old companies ,even for trained eye without a loupe, could have been fool ,certainly tell u either they are using the same skill & tool or swiss craftsmanship is falling behind ?I see the bezel finish on the real watch could have been much better for a watch asking for such a high $.And that they need more innovation to keep their status !