The Vacheron Constantin Traditionnelle Twin Beat Perpetual Calendar has captured the eyes of SIHH 2019. The watch is revolutionary in the sense that it can be customized by the push of a button to the users wearing habits and activity levels. Considering that the two balances in the watch are beating at different speeds, the mainspring becomes a source of variable energy levels depending resting and active states. Check out the video for Tim Mosso’s full review.