As if the tourbillon isn’t impressive enough on its own, the calibre L102.1 steps things up with two additions – a stop-seconds mechanism and a zero-reset function. The first is sometimes called “hacking seconds,” meaning that when you pull out the crown, the balance stops so you can set the time to the precise second (you can see the spring that stops the balance in the close-up above). On top of that, when the crown is pulled, the seconds hand also snaps back to zero, letting you set to the exact minute on-demand, accurate to the second.

The 1815 Tourbillon will be made in pink gold and platinum, with the latter limited to only 100 pieces. They are priced at $164,100 and $201,300, respectively. For more, visit A. Lange & Söhne.