How do they polish those concave scalloped steel gears in the back? I don't get it... It's amazing! Also... Put this watch on your nightstand at night. And on a very quiet night, you'll realize how loud the Robin Escapement is! Makes me wonder if the sound is coming from impacts or friction and if there is a lot of energy loss - although the AP escapement is supposedly more efficient than the Swiss Lever system. But it's an amazingly loud watch! I was sleeping and thinking, "what is that sound?"