Citizen BY0100-51H – Precision in Motion
Where high-performance technology meets timeless design.

The Citizen BY0100-51H is a masterclass in modern watchmaking, powered by light with Eco-Drive technology and synced to atomic time across 26 cities worldwide. Its sleek stainless steel case, sapphire crystal, and rich grey dial make a powerful impression, while features like the perpetual calendar, 1/5-second chronograph, and 200M water resistance ensure you’re always ready—whether in the boardroom or off the grid.

Atomic Timekeeping

Eco-Drive (No Battery Changes)

Perpetual Calendar

Sapphire Crystal

200M Water Resistance

Power Reserve Indicator

Classic form. Cutting-edge function.

Own the watch that keeps perfect time—anywhere on Earth.