CHPTR_Δ.8 [KAIROS] with stainless steel bracelet

Take advantage of our Special Launch Offer by ordering the rubber strap version  and receiving a complimentary stainless steel bracelet. Thanks to the easy-clip system, you can effortlessly switch between the two styles yourself.

CHPTR_Δ is the first BA111OD manufacture watch complication: a unique timepiece that represents time in a revolutionary way. 

CHPTR_Δ.8 [KAIROS] features a pure aesthetic with its stainless steel case. Incorporating all the characteristics of the 44mm bestseller, this version embodies the quintessence of contemporary watch design, highlighting simplicity and sophistication in perfect balance.

Rather than simply rotating a hand around a central axis, the movement was designed to "roll" a satellite hour wheel around a fixed central hour wheel. When a wheel is rotated around another wheel, the trajectory described by any point on this satellite wheel is a cycloid. There are several types of cycloids: in this BA111OD chapter, the chosen cycloid is a deltoid (with a ratio of 1/3), and as a result, the trajectory described by the tip of the hour hand is... a triangle.

Created with the help of renowned watchmaker Olivier Mory, CHPTR_Δ's asymmetrical reading of time is a world premiere that promises to captivate and inspire anyone who seeks a new and unique way of reading time.