HW31 Automatic

HW31 Automatic


- Hysek Calibre HW31
- Automatic Mechanical
- Hour, minute & second
- Micro-rotor on the back side
- Small seconds at 6 o’clock
- 145 components
- 32 jewels
- Autonomy 62h
- Frequency 28’800 VpH

HW31 Movement is a real in-house caliber: indeed, with the exception of the spring, the anchor, and the barrel spring, the movement is fully manufacture made. Sporting a total of 145 components, the production and finishes have been optimised to allow a starting price for the finished timepiece.

Its winding mechanism uses a micro-rotor rather than a complete oscillating weight. The micro-rotor is an art mastered by Hysek and used on most of its creations; ensuring it performs as well as a traditional rotor is a particularly delicate feat of watchmaking.

This feat is very much in evidence here. The micro-rotor is made from a heavy metal, allowing the IO Automatic Manufacture to boast a power reserve when fully wound of up to 62 hours, despite taking up only a very small space within the movement. This allows the latter to be slimmer, whilst also accommodating the large barrel required for this kind of duration. The micro-rotor will also enable Hysek to leave space in the movement for modular or integrated complications to be added. In short, the IO Automatic Manufacture is a timepiece with a promising future, opening up a new creative era for Hysek


Hysek’s new basic caliber – an automatic with three hands. Its apparent simplicity actually took several years to develop; its mechanical ingenuity will allow it to be used as a foundation for the firm’s forthcoming collections.