I've recently purchased an IWC 3717-01. Lovely watch. However, I've noticed that if I shake the watch, even just gently, it's making a series of fairly audible odd sounds, first a spinning sound, then like a spring unrolling and finally a couple or three clicking sounds. Not super loud, but you can clearly hear it if you put your ear to it, and you can feel the case gently shaking during its spins and clicks.
I've considered heading back to the shop and ask if this is normal.. This is my first automatic, so might just be me being extremely sensitive.