As tourbillons were traditionally used to ensure the accuracy of a watch in various positions, Lange (wisely) deemed it sensible to have some way of quickly and easily setting the watch to the nearest second. So, when you pull the crown out, the movement resets the seconds hand to zero and stops the tourbillon, allowing you to restart in coordination with another time. It’s nerdy, highly technical, and very Lange.
Introducing The A. Lange & Sohne 1815 Tourbillon With Enamel Dial Limited Edition (Live Pics & Pricing)
