Watch
Citizen Calendrier World Time Stainless Steel Blue Dial Eco-Drive BU2021-51L 100M Men's Watch
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The Citizen Calendrier World Time BU2021-51L is a sophisticated men's watch that combines classic styling with global functionality, perfect for the modern traveler or business professional. Featuring a striking dark blue dial housed within a robust stainless steel case and bracelet, this timepiece offers everyday refinement and a modern presence.
Powered by Citizen's innovative Eco-Drive technology, the watch harnesses light from any source, meaning it never needs a battery change, providing worry-free convenience. Its 44mm case ensures a comfortable fit for daily wear, while luminous hands guarantee legibility even in low-light conditions.
Key Highlights:
- Eco-Drive Technology: Powered by light, never needs a battery.
- World Time Functionality: Displays time in 24 cities for effortless time zone management.
- Durable Construction: Crafted entirely from stainless steel with 100m water resistance.
- Multifunction Dial: Includes day, date, and 12/24 hour subdials for comprehensive information at a glance.
The Calendrier collection blends classic aesthetics with advanced features, making the BU2021-51L an accomplished companion for those who value precision, global functionality, and maintenance-free convenience.
Specifications
- Brand
- Citizen
- Model/Ref
- BU2021-51L
- Gender
- Men's
- Movement
- Eco-Drive (Light-Powered)
- Case Size
- 44mm
- Case Material
- Stainless Steel
- Dial Colour
- Blue
- Band Material
- Stainless Steel
- Water Resistance
- 100m / 10ATM
- Functions
- World Time (24 Cities), Day, Date, 12/24 Hour Subdial, Luminous Hands
- Display
- Analog
How it works
What this watch’s key specs actually mean on the wrist.
Solar
Solar-powered movement
A solar cell under the dial turns any light — sunlight or a desk lamp — into power and stores it in a cell that lasts for months in the dark. You get quartz accuracy with no battery changes to think about, ever.
100m / 10 ATM
Water resistance
Rated to 100m / 10 ATM — genuinely swim-ready. Laps, snorkeling and a day at the beach are all no problem; it just isn't a scuba watch.
24-hour reserve
Power reserve
Fully wound, this movement stores about 24 hours of running time when it's off your wrist. Enough to comfortably carry it overnight without resetting the time. Power reserve is simply how long the mainspring keeps the watch going once you stop wearing it.
44mm
Case size
The case measures 44mm across (excluding the crown) — a modern, present size with real wrist presence, at its best on medium-to-larger wrists. Case size is the single biggest factor in how a watch actually wears, so it's worth picturing against your own wrist.
Stainless steel
Case material
Stainless steel is the all-rounder for good reason: tough, corrosion-resistant, and easy to refinish if it ever picks up a scratch. 316L is the marine-grade alloy used across quality watchmaking — durable enough for daily life and smart enough to dress up.
Frequently Asked
What is the power source for the Citizen Calendrier BU2021-51L?
The Citizen Calendrier BU2021-51L is powered by Eco-Drive technology, which means it harnesses light from any source and never requires a battery replacement.
Is this watch suitable for swimming?
Yes, with a water resistance of 100 meters (10 ATM), the Citizen Calendrier BU2021-51L is suitable for swimming and poolside activities.
What is the case size of this watch?
The Citizen Calendrier BU2021-51L features a 44mm case, offering a modern presence that remains comfortable for daily wear.
Does this watch have world time capabilities?
Yes, the Citizen Calendrier BU2021-51L includes world time functionality, allowing you to easily manage schedules across 24 different time zones.
What material is the watch case and band made from?
Both the case and the band of the Citizen Calendrier BU2021-51L are crafted entirely from durable stainless steel.
Are the hands visible in the dark?
Yes, the watch features luminous hands, enhancing legibility and allowing for confident reading even in low-light conditions.
This piece ships through our authorized dealer network. Any applicable customs or import fees are collected up front at checkout, so nothing extra is owed when your order is delivered.
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