Citizen
Citizen Tsuku-yomi Chronograph Blue Dial Eco-Drive 100M BY1010-81L 43.00mm Titanium Watch
A solar-powered titanium chronograph with moon-phase display, sapphire crystal and 100 m water resistance
- StyleChronograph
- MaterialTitanium
- MovementSolar
- ShapeRound
- Dial ColorBlue
- Dial MarkersIndex
- Eco-Drive solar movement powers the watch without battery changes
- Super Titanium case and bracelet deliver lightweight strength and corrosion resistance
- Sapphire crystal protects the blue dial from scratches
- 100 m water resistance suits swimming and snorkelling
- H874 calibre adds chronograph and moon-phase functions
Super Titanium Eco-Drive Chronograph
The Citizen Tsuku-yomi BY1010-81L is a solar-powered chronograph built from lightweight Super Titanium for the case and bracelet. A blue dial with index markers and a day-date display sits under sapphire crystal. Water resistance to 100m suits swimming and snorkelling. The deployment clasp secures the bracelet on the wrist.
Solar Movement Daily Reliability
The Eco-Drive calibre H874 converts any light source into electrical energy, removing the need for periodic battery changes. A full charge provides a long power reserve so the watch keeps running through extended periods in low light. The screw-down crown maintains the 100m seal during everyday wear and water exposure.
43mm Case Defines Wrist Presence
The 43.00mm titanium case diameter determines how the watch sits on the wrist and whether it fits under a shirt cuff. Buyers needing a smaller or larger profile should check this dimension against their preference before purchasing.
Highlights
- Eco-Drive solar movement powers the watch without battery changes
- Super Titanium case and bracelet deliver lightweight strength and corrosion resistance
- Sapphire crystal protects the blue dial from scratches
- 100 m water resistance suits swimming and snorkelling
- H874 calibre adds chronograph and moon-phase functions
Specifications
| Brand | Citizen |
|---|---|
| Style | Chronograph |
| Material | Titanium |
| Movement | Solar |
| Shape | Round |
| Dial Color | Blue |
| Dial Markers | Index |
| Display | Analog |
| Date | Date |
| Band Material | Titanium |
| Fastener | Deployment Clasp |
| Gender | Male |
| Condition | New |
| Bezel | Fixed Bezel |
| Case Back | Screw Down Crown |
| Case Material | Titanium |
| Case Thickness | 43.00 mm |
| Crystal | Sapphire Crystal |
| Water-Resistant | 100m |
| Special Features | Sapphire Crystal,Deployment Clasp,Day and Date Display,Screw Down Crown |
Questions about this item
Does the Eco-Drive movement generate noticeable heat when worn continuously?
The solar-powered Eco-Drive movement has no battery to replace and produces no perceptible heat during all-day wear.
What strap tools are required to adjust the Super Titanium bracelet?
The titanium bracelet uses a deployment clasp with micro-adjustment holes; a spring-bar tool or pin pusher is needed to add or remove links.
Will the 43.00 mm case and sapphire crystal sit flush under a standard shirt cuff?
The 43.00 mm Super Titanium case and domed sapphire crystal have a low profile that slides easily under most business-shirt cuffs.
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