Citizen
Citizen Tsuki-yomi A-T Moon Phase Titanium Purple Dial Eco-Drive 100M Watch
Solar-powered titanium watch with moon phase, day and date display, sapphire crystal and 100m water resistance
- StyleCasual
- MaterialTitanium
- MovementSolar
- ShapeRound
- Dial ColorPurple
- Dial MarkersIndex
- Solar Eco-Drive movement eliminates battery changes
- Titanium case and band weigh less than steel
- Sapphire crystal resists scratches from daily wear
- 100 m water resistance suits swimming and snorkelling
- Moon-phase complication tracks lunar cycle on dial
Titanium Moon-Phase Solar Watch
The Citizen Tsuki-yomi A-T BY1010-81Z is a men’s titanium wristwatch with a purple dial and moon-phase complication. Solar Eco-Drive movement charges from any light source, removing the need for battery changes. A 43.00 mm case and 10.90 mm profile sit on a matching titanium bracelet with a deployment clasp. Water resistance is rated to 100 metres.
Installation And Common Issues
Adjust the bracelet by removing or adding links with standard watch tools; the deployment clasp then secures with a single press. Pull the crown to the first position for date correction and to the second for time and moon-phase setting; the atomic timekeeping signal synchronises automatically overnight. Avoid operating the crown or pushers while the watch is wet, and rinse with fresh water after salt-water exposure to keep the gaskets clean.
Pre-Purchase Checks
Verify that a 43.00 mm case diameter and 10.90 mm thickness suit your wrist size and shirt-cuff clearance. Confirm that 100-metre water resistance meets your swimming or snorkelling requirements. Ensure you can provide regular light exposure — natural or artificial — to keep the solar cell charged. The fixed bezel and sapphire crystal are not user-replaceable, so factor long-term durability into the decision.
Highlights
- Solar Eco-Drive movement eliminates battery changes
- Titanium case and band weigh less than steel
- Sapphire crystal resists scratches from daily wear
- 100 m water resistance suits swimming and snorkelling
- Moon-phase complication tracks lunar cycle on dial
Specifications
| Brand | Citizen |
|---|---|
| Style | Casual |
| Material | Titanium |
| Movement | Solar |
| Shape | Round |
| Dial Color | Purple |
| Dial Markers | Index |
| Display | Analog |
| Date | Date |
| Band Material | Titanium |
| Fastener | Deployment |
| Gender | Male |
| Condition | New |
| Bezel | Fixed Bezel |
| Case Material | Titanium |
| Case Thickness | 43.00 mm |
| Crystal | Sapphire Crystal |
| Water-Resistant | 100m |
| Special Features | Sapphire Crystal,Deployment Clasp,Day and Date Display |
Questions about this item
How can I verify the watch is synchronising correctly after I set it up?
The solar movement will charge from any light source; the analog hands and day-date display should advance smoothly once the dial has absorbed enough energy.
What comes in the box and is anything extra needed to start using it?
The titanium case and bracelet, sapphire crystal, deployment clasp and solar movement are all included; no separate battery or charger is required.
Which version of the Tsuki-yomi should I choose if I want the purple dial with moon phase and atomic timekeeping?
The BY1010-81Z reference matches the 43.00 mm titanium case, 10.90 mm thickness, purple dial, 100M water resistance and Eco-Drive A-T moon phase specification.
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