Revamped aesthetics

On the other hand, the dial has been made more intricate. It has been openworked to expose more of the twin barrels, along with the new feeler-and-cone power reserve mechanism.

In terms of color, Armin Strom has adopted the fashionable light blue and combines it with black to create a strong contrast and a refreshing look and feel. Notably, the application of light blue continues throughout the watch, and in an unusual manner, the movement plates are also dressed up in light blue, completing a full package and demonstrating attention to detail.

Seven days running time

Furthermore, the movement holds special significance for the brand, not only because of the power reserve, but also because it represents the brand’s inaugural movement development. According to the brand, it developed and constructed the ARM09 in 2009, and it was employed in the 2010 launch of the original version of the One Week.

Today, the new ARM21 movement retains the distinctive one-week power reserve but has undergone several upgrades. First, the beat rate has been increased from 18,000 vibrations per hour to 25,200 vibrations per hour, which should result in improved timekeeping stability.

As the watch is wound and unwound, a visible cone located around seven o’clock moves up and down a vertical screw. This movement of the cone is then sensed by a ruby-tipped feeler, positioned just below the eight o’clock marker. The feeler reads the cone’s height (via tension) and transmits this information to the power reserve display at 11 o’clock. The transmission itself is not visible, as it is concealed beneath the time-telling sub-dial, and it occurs through a rack and an intermediate wheel. 

Armin Strom One Week First Edition Specs and Price