Citizen Calendrier BU2021-51L Eco-Drive Watch
BU2021-51L
- In stock, ready to ship
- Arriving soon · Available to pre-order
Estimated 3–6 business days from order to delivery.
Includes 0–2 business days to prepare and 3–4 in transit. Engraving adds 1–2 days. Estimates exclude weekends and holidays; destination and carrier delays can affect timing. Delivery detailsCitizen Calendrier BU2021-51L Eco-Drive Watch Details
The Citizen Calendrier BU2021-51L combines global functionality with a polished stainless-steel design. Its substantial 44mm silver-tone case and bracelet frame a dark blue dial with luminous hands and a multi-register layout for world time, day, date, and 12/24-hour information.
Description
Citizen’s caliber 8729 Eco-Drive movement runs on natural or artificial light, eliminating routine battery replacement. An anti-reflective mineral crystal, deployment-clasp bracelet, and 100-meter water resistance make this feature-rich watch practical for travel and everyday wear.
Specifications
- Brand: Citizen
- Collection: Calendrier
- Model: BU2021-51L
- Movement: Caliber 8729 Eco-Drive
- Power source: Powered by natural or artificial light
- World time: 24 cities
- Calendar: Analog day and date displays
- Additional function: 12/24-hour time
- Case material: Silver-tone stainless steel
- Case width: 44mm
- Lug width: 23mm
- Dial: Dark blue
- Hands: Luminous
- Crystal: Anti-reflective mineral crystal
- Bracelet: Silver-tone stainless steel
- Clasp: Deployment clasp with push buttons
- Water resistance: 100 meters / 10 bar / 333 feet
Included with your purchase: 5-year Citizen limited warranty card included.
Watch specifications
- Brand
- Citizen
- Model
- BU2021-51L
- Movement
- Eco-Drive, Caliber 8729
- Display
- Analog
- Case diameter
- 44 mm
- Crystal
- Anti-reflective mineral crystal
- Dial color
- Blue
- Band material
- Stainless steel
- Water resistance
- 100 meters / 10 bar / 333 feet
- Warranty
- 5 years
Free Standard shipping: estimated 3–4 business days in transit. Express: $15, estimated 1–2 business days in transit. Regular in-stock orders normally ship from the same business day to two business days after purchase. Engraving adds 1–2 business days before shipment. Transit begins when the carrier receives your parcel. Available options and calculated carrier rates appear at checkout. We email tracking when your order ships. See our Shipping & Delivery Policy.
Request an eligible return within 30 days of delivery. Watch Technicians pays shipping for approved returns and emails a prepaid label through Shopify. Wait for approval and use our label. Watches must be unused, unworn, unsized, and complete with original materials. Start a return or exchange.
Engraved or otherwise personalized watches are final sale and are not eligible for returns, exchanges, or refunds for a change of mind. This does not limit remedies for items that arrive damaged, defective, or incorrect, or rights required by applicable law. Review the Return & Refund Policy.
Seiko watches include a 3-year warranty. Citizen watches include a 5-year limited warranty. Every watch is sold as authentic merchandise through Watch Technicians. Warranty terms for Timex and other brands follow the documentation included with the product.
Pickup availability is based on the selected variant and current store inventory. Eligible pickup locations and estimated readiness appear near the purchase buttons. We will notify you when the order is ready; please wait for confirmation before traveling to the store.
Engraving preparation: Allow 1–2 additional business days before shipping or pickup. Engraved or otherwise personalized watches are final sale and are not eligible for returns, exchanges, or refunds for a change of mind. This does not limit remedies for items that arrive damaged, defective, or incorrect, or rights required by applicable law. Review the Return & Refund Policy.
Questions about BU2021-51L
How is the BU2021-51L powered?
This Citizen Eco-Drive watch converts light into electricity and stores it in a rechargeable power cell. It does not need regular disposable-battery changes.
How do I charge my BU2021-51L?
Keep the dial exposed to light rather than covered by a sleeve or stored in a dark drawer. Daylight generally charges more efficiently than indoor lighting. Follow the caliber manual for charging time and any reset or setting steps; the time needed varies with light intensity and remaining charge. Avoid excessive heat, including a hot car dashboard or placing the watch close to a lamp.
What is the difference between automatic and Eco-Drive or Solar?
Automatic watches store mechanical energy in a mainspring wound by wrist movement. Citizen Eco-Drive and Seiko Solar watches store electrical energy collected from light in a rechargeable cell. Wearing an automatic helps wind it; exposing a light-powered watch to light helps charge it. They need different care and restart routines.
Does my BU2021-51L need maintenance?
Light charging removes the need for regular disposable-battery changes, but the watch still needs care. The rechargeable cell and movement may need professional service over time. If it does not run after the charging steps in its manual, contact our watch technicians.
What case size is the BU2021-51L?
The listed case diameter is 44 mm. Compare this with a watch you already wear. Case shape, thickness and the distance across the lugs also affect fit; a wrist photo is a visual reference rather than a guarantee of how it will fit your wrist.
What is the water-resistance rating of the BU2021-51L?
The listed rating is 100 meters / 10 bar / 333 feet. Use the manufacturer’s guidance for the activities suitable for this model, secure the crown before water contact and never operate it underwater. Gaskets can wear, so have water resistance checked before relying on it for swimming or diving.
How does the band on the BU2021-51L fit?
The listed band is Stainless steel. Contact our watch technicians for help checking fit before purchase. Professional bracelet sizing is complimentary. Contact our watch technicians about fit or visit an eligible St. Louis pickup location. Sized watches are excluded from standard returns; check the return policy before requesting sizing.
What complimentary extras are included?
A protective travel case is included with a qualifying watch purchase. Engraving is optional and complimentary where the watch’s design permits it. Your brand’s warranty and local support details appear above.
Where can my message be engraved?
Your selected engraving placement is subject to review. Glass casebacks or the watch’s design may prevent engraving in that spot. If needed, we’ll contact you to approve a suitable alternative, such as the clasp or back of a lug, before engraving.
Engraving adds 1–2 business days before shipment or pickup. Personalized watches are final sale for change-of-mind returns; damaged, defective or incorrect items follow our refund policy. Return details