For the first time in its history, H. Moser & Cie. has created a perpetual calendar with two windows displaying the date and month. The aim of this development is to offer optimal legibility in the brand's sportiest line: Pioneer. The Pioneer Perpetual Calendar MD features a steel case water resistant to 120 meters, enabling it to display the time under any conditions, whether on land or underwater. A practical, wearable perpetual calendar for everyday heroes. In 2015, H. Moser & Cie. launched the Pioneer collection. This contemporary collection, imbued with a pioneering, adventurous spirit, was the obvious choice to accommodate the brand's new perpetual calendar with dual window display.