CITIZEN ECO-DRIVE BY1034-59A RADIO CONTROLLED STAINLESS STEEL MEN WATCH
BY1034-59A
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- 3 Years Warranty
The Citizen BY1034-59A solves a problem that has bothered moon phase owners for as long as the complication has existed. Traditional moon phase displays drift, because the lunar cycle doesn't align neatly with calendar months — so they need periodic manual correction. This one doesn't. Citizen's Luna Program uses the radio-controlled signal to keep the fully analog moon phase display continuously accurate, without you ever touching it.
Add global radio-controlled atomic time synchronisation, a perpetual calendar that also never needs correction, world time for 24 cities, and a power saving function that extends the Eco-Drive reserve — and you have a watch that essentially maintains itself. The moon phase indicator shows the current lunar position with Northern and Southern Hemisphere switching.
The white sunburst dial and two-tone stainless steel case and bracelet, with warm gold-tone accents along the bezel and pushers, give it a refined presence. At 42mm and just 10.72mm thick with sapphire crystal and 100m water resistance, it wears like a dress watch with the technical capability of a far more expensive complication piece. Powered by Calibre H874 Eco-Drive — no battery required, ever.
At a Glance
- BrandCitizen
- MovementCalibre H874 Eco-Drive
- Case Size42mm
- Thickness10.72mm
- DialWhite Sunburst
- FinishTwo-Tone Stainless Steel
- Moon PhaseSelf-Correcting, N/S Hemisphere
- TimekeepingGlobal Radio-Controlled
- CalendarPerpetual
- World Time24 Cities
- GlassSapphire Crystal
- Water Resistance100m
Why You'll Love It
- The moon phase never needs manual correction. Most moon phase watches drift and require periodic adjustment — Citizen's Luna Program uses the radio signal to keep the display continuously accurate on its own.
- Global radio-controlled synchronisation means the time corrects itself against atomic clock signals — no manual setting, no drift.
- The perpetual calendar handles varying month lengths and leap years automatically, so the date never needs correcting either.
- Between the self-correcting moon phase, atomic time, and perpetual calendar, this is a watch that essentially maintains itself — genuinely rare at this price.
- Northern and Southern Hemisphere moon phase switching means the display stays correct wherever you are in the world.
- World time across 24 cities makes it genuinely useful for travel, alongside the automatic time correction.
- The two-tone white-dial configuration is the most classical and versatile option in the collection — warm gold-tone accents on the bezel and pushers against a white sunburst dial.
- At 42mm and just 10.72mm thick, it has genuine dress watch proportions despite the complication stack, and sapphire crystal keeps the dial protected.
Perfect For
- Complication Watch Collectors
- Moon Phase Enthusiasts
- Eco-Drive & Solar Watch Fans
- Frequent Travellers
- Office & Formal
- Low-Maintenance Ownership
- Milestone Gift
Key Features
- Luna Program self-correcting moon phase — a fully analog display that updates via radio signal, never requiring manual correction.
- Northern/Southern Hemisphere moon phase switching — accurate wherever you are.
- Global radio-controlled timekeeping — automatic atomic time synchronisation, accurate to approximately ±15 seconds per month even without signal reception.
- Perpetual calendar — automatically accounts for varying month lengths and leap years.
- World time in 24 cities — reference a second time zone directly from the dial.
- Power saving function — extends the Eco-Drive reserve when the watch isn't in use.
- Citizen Eco-Drive Calibre H874 — light-powered movement, no battery required, holding a charge for approximately 6 months in full darkness once fully charged.
- Insufficient Charge Warning and Overcharge Prevention — the watch manages and protects its own charge automatically.
- Sapphire crystal — scratch-resistant protection for the dial.
- 42mm two-tone stainless steel case — 10.72mm thick, with warm gold-tone accents on the bezel and pushers.
- Luminous hands and indexes — legible in low light.
- Two-tone stainless steel bracelet — three-fold clasp with push-button release.
- 100-metre water resistance (10 BAR) — rated for handwashing, rain, everyday splashes and swimming.
Technical Specifications
The Citizen BY1034-59A is a 42mm men's Eco-Drive watch powered by Calibre H874, combining global radio-controlled atomic timekeeping with a Luna Program self-correcting analog moon phase, perpetual calendar, world time across 24 cities, and a power saving function. The two-tone stainless steel case measures 10.72mm thick with sapphire crystal and warm gold-tone accents on the bezel and pushers, water resistant to 100 metres. The white sunburst dial carries luminous hands and indexes with a moon phase display offering Northern/Southern Hemisphere switching. It's finished on a two-tone stainless steel bracelet with a three-fold clasp and push-button release.
| Model Number | BY1034-59A |
| Case Material | Two-Tone Stainless Steel |
| Case Diameter | 42.0mm |
| Case Thickness | 10.72mm |
| Case Length | 47.6mm |
| Lug Width | 21.0mm |
| Accents | Gold-Tone Bezel & Pushers |
| Glass | Sapphire Crystal |
| Water Resistance | 100 Metres (10 BAR) |
| Colour | White, Sunburst |
| Hands & Markers | Luminous |
| Moon Phase | Fully Analog, Self-Correcting, N/S Hemisphere Switching |
| Display | Hours, Minutes, Seconds, Perpetual Calendar, World Time |
| Material | Two-Tone Stainless Steel |
| Clasp | Three-Fold, Push-Button Release |
| Caliber | Citizen H874 |
| Type | Eco-Drive (Light-Powered) |
| Timekeeping | Global Radio-Controlled |
| Accuracy (No Signal) | Approx. ±15 Seconds/Month |
| Moon Phase System | Luna Program |
| Calendar | Perpetual Calendar |
| World Time | 24 Cities |
| Full Charge Reserve | Approx. 6 Months |
| Functions | Power Saving, Insufficient Charge Warning, Overcharge Prevention |
Best Matched With
- Navy Suit
- White Dress Shirt
- Charcoal Blazer
- Brown Leather Belt
- Grey Wool Trousers
- Camel Overcoat
Frequently Asked Questions
Does the moon phase need manual correction?
No — and that's the point of this watch. Most moon phase displays drift over time because the lunar cycle doesn't align neatly with calendar months, so they need periodic adjustment. Citizen's Luna Program uses the radio-controlled signal to keep the moon phase display continuously accurate on its own.
What does "global radio-controlled" mean?
The watch receives time signals from atomic clock transmitters and automatically corrects itself for perfect accuracy — no manual time-setting needed. Outside signal coverage, it keeps time as a highly accurate quartz watch, to approximately ±15 seconds per month, until the next signal is received.
What is the Northern/Southern Hemisphere switching?
The moon appears mirrored depending on which hemisphere you're viewing it from. This watch lets you switch the moon phase display between Northern and Southern Hemisphere orientations, so it stays accurate wherever you are.
What is a perpetual calendar?
A perpetual calendar automatically accounts for months of different lengths and leap years, so the date display stays correct without you ever needing to manually adjust it at month-end.
What is Eco-Drive?
Eco-Drive is Citizen's light-powered movement technology. A cell beneath the dial converts any light source — sunlight, a lamp, an overhead office light — into energy stored in a rechargeable cell, so the watch never needs a battery.
How long does the charge last if I stop wearing it?
Approximately 6 months from a full charge with no further light exposure. A power saving function extends this further when the watch isn't in use, and an Insufficient Charge Warning alerts you before the reserve runs out.
Can I use this to track a second time zone?
Yes. World time across 24 cities is built into the movement, so you can reference another zone directly from the dial — useful for travel, especially combined with the automatic radio time correction.
Can I swim with this watch?
The case is rated to 100 metres, which comfortably covers handwashing, rain, everyday splashes and swimming. It's not designed for diving.
Will 42mm fit my wrist?
42mm runs slightly larger than the standard 40mm men's size and suits medium to larger wrists well. At just 10.72mm thick, it stays comfortably slim for a watch with this many complications.
Is the bracelet adjustable?
Yes. The bracelet can be resized by adding or removing links. City Chain offers complimentary bracelet sizing at any outlet — bring your warranty book along for the service.
What warranty does this watch come with?
The BY1034-59A comes with a 3-year warranty when purchased from City Chain Singapore, an authorised Citizen retailer. Keep your warranty card and proof of purchase — both are required when submitting the watch for service at any City Chain outlet.
Why Buy from City Chain Singapore
- Authorised Retailer 100% genuine Citizen product
- 3-Year Warranty Covered on every purchase
- Free Shipping All orders within Singapore
- Bracelet Adjustment Size it in-store
Extra $15 OFF with min. $200 spend
Use Code: FORYOU15
Extra $30 OFF with min. $400 spend
Use Code: FORYOU30
Caliber No.: H874
Movement: Eco-Drive
Strap: Stainless Steel
Water Resistant: Water Resistant 50m
Thickness: 10.72mm
Case Size: 42mm
Case: Stainless Steel
Glass: Sapphire Glass
Maximum run time from full charge (Normal Use Condition): Approximately 6 months
24 World Cities Time
24hrs, Date and Day Display
Eco-Drive
Global Radio-Controlled
Insufficient Charge Warning Function
Luminous Hands and Index
Magnetic resistance
Moon Phase Display
Overcharge Prevention Function
Perpetual Calendar
Power Saving Function
Summer Time ON / OFF
Delivery within Singapore
Order by 11AM
(Mon - Fri for faster processing)
Checkout options may vary depending on order value and eligibility.
• Free Speedpost Domestic Delivery — 1–2 business days
• Free DHL Domestic Delivery — next business day
• Express Delivery — S$30, order by 2PM
• Click & Collect — ready in 2–3 business days. Please wait for the collection confirmation email before visiting the store.
Weekend & Public Holiday Orders
Orders placed after the applicable cut-off time, on weekends, or on public holidays will be processed on the next business day. Delivery will take place on the next available business day based on the selected delivery service.
During peak periods, festive seasons, major launches or sale events, additional processing and delivery time may be required.
For online purchase, you can have bracelet or leather strap adjustments done at any City Chain store. Please bring along your warranty book for the service.
