Accuracy Born of Light
This model is the world’s first to achieve high precision of ±5 seconds per year through the light-powered Eco-Drive. Balancing universality and a sense of luxury was a major challenge in the design process. Because the system generates electricity by receiving light on the dial, the dial must have a light-transmitting structure. We struggled to express a luxurious look for the dial within such a structure. Including the watch itself, we repeatedly prototyped the dial many times before finally bringing it to market. In this model, the dial was modified due to a movement change, but it is still on sale today.