CITIZEN ECO-DRIVE BY1035-56E RADIO CONTROLLED STAINLESS STEEL MEN WATCH
BY1035-56E
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- 3 Years Warranty
The Citizen BY1035-56E is the all-black edition of Citizen's radio-controlled moon phase collection — black dial, black ion-plated case, and black ion-plated stainless steel bracelet. It takes every complication of the two-tone version and wraps it in a stealth finish that reads as modern, assertive, and suited to darker wardrobes.
Most moon phase watches drift and need periodic manual correction, because the lunar cycle doesn't align neatly with calendar months. This one doesn't. The fully analog moon phase display updates itself via radio signal — no manual correction required, ever. Against the black dial, the moon phase sub-dial becomes the primary visual focal point rather than a supporting detail.
Add global radio-controlled atomic time synchronisation, a perpetual calendar, world time for 24 cities with Summer Time ON/OFF, magnetic resistance, and a power saving function extending the approximately 6 months of power reserve. At 42mm and 10.72mm thin with sapphire crystal, it has the proportions of a dress watch with the technical capability of a far more expensive complication piece. Powered by Calibre H874 Eco-Drive — no battery required, runs on any light source.
At a Glance
- BrandCitizen
- MovementCalibre H874 Eco-Drive
- Case Size42mm
- Thickness10.72mm
- DialBlack
- FinishBlack Ion-Plated
- Moon PhaseSelf-Correcting Analog
- TimekeepingGlobal Radio-Controlled
- CalendarPerpetual
- World Time24 Cities
- GlassSapphire Crystal
- Full Charge ReserveApprox. 6 Months
Why You'll Love It
- The moon phase never needs manual correction. Most moon phase displays drift over time and require periodic adjustment — this one updates itself continuously via the radio signal.
- Against the black dial, the moon phase sub-dial becomes the primary visual focal point — this is the version that draws attention to the complication rather than the case.
- The black ion-plated finish across case and bracelet gives this a genuinely stealthy, contemporary presence the two-tone version doesn't attempt.
- 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.
- World time across 24 cities with Summer Time ON/OFF makes it genuinely useful for travel and daylight saving changes.
- Magnetic resistance adds real everyday resilience — useful given how much modern life involves magnets and electronics.
- At 42mm and just 10.72mm thick with sapphire crystal, it keeps dress watch proportions despite carrying a full complication stack.
Perfect For
- Complication Watch Collectors
- Moon Phase Enthusiasts
- All-Black & Stealth Styling
- Eco-Drive & Solar Watch Fans
- Frequent Travellers
- Statement Watch Wearers
- Milestone Gift
Key Features
- Self-correcting analog moon phase — updates via radio signal, never requiring manual correction.
- All-black ion-plated case and bracelet — with a matching black dial for a full stealth finish.
- Global radio-controlled timekeeping — automatic atomic time synchronisation.
- Perpetual calendar — automatically accounts for varying month lengths and leap years.
- World time in 24 cities — with Summer Time ON/OFF for daylight saving regions.
- 24-hour, date and day display — comprehensive at-a-glance information.
- Magnetic resistance — added everyday resilience.
- 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.
- Luminous hands and indexes — legible in low light against the black dial.
- 42mm case — 10.72mm thick, with 50-metre water resistance.
Technical Specifications
The Citizen BY1035-56E is a 42mm men's Eco-Drive watch powered by Calibre H874, combining global radio-controlled atomic timekeeping with a self-correcting analog moon phase, perpetual calendar, world time across 24 cities, magnetic resistance and a power saving function. The black ion-plated stainless steel case measures 10.72mm thick with sapphire crystal, water resistant to 50 metres. The black dial carries luminous hands and indexes with a moon phase display. It's finished on a matching black ion-plated stainless steel bracelet.
| Model Number | BY1035-56E |
| Case Material | Black Ion-Plated Stainless Steel |
| Case Diameter | 42mm |
| Case Thickness | 10.72mm |
| Glass | Sapphire Crystal |
| Water Resistance | 50 Metres |
| Colour | Black |
| Hands & Markers | Luminous |
| Moon Phase | Fully Analog, Self-Correcting |
| Display | Hours, Minutes, Seconds, 24-Hour, Date, Day, World Time |
| Material | Black Ion-Plated Stainless Steel |
| Caliber | Citizen H874 |
| Type | Eco-Drive (Light-Powered) |
| Timekeeping | Global Radio-Controlled |
| Calendar | Perpetual Calendar |
| World Time | 24 Cities, Summer Time ON/OFF |
| Construction | Magnetic Resistance |
| Full Charge Reserve | Approx. 6 Months |
| Functions | Power Saving, Insufficient Charge Warning, Overcharge Prevention |
Best Matched With
- Charcoal Suit
- Black Leather Belt
- Dark Overcoat
- Monochrome Styling
- Smart-Casual Black
- Evening Wear
Frequently Asked Questions
Does the moon phase need manual correction?
No. Most moon phase displays drift over time because the lunar cycle doesn't align neatly with calendar months, so they need periodic adjustment. This watch uses the radio-controlled signal to keep the moon phase display continuously accurate on its own.
How is this different from the two-tone version?
Same Calibre H874 movement, same self-correcting moon phase, same perpetual calendar and world time — the difference is finish. This all-black ion-plated edition reads darker and more contemporary, and the moon phase sub-dial stands out more sharply against the black dial. The two-tone BY1034-59A is the more classical, versatile option.
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 continues keeping time as a highly accurate quartz watch until the next signal is received.
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 does magnetic resistance do?
It protects the movement from the magnetic fields found in everyday objects — laptops, speakers, phone cases, bag clasps — which can otherwise affect timekeeping accuracy in a conventional watch.
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 swim with this watch?
No. With 50-metre water resistance it's rated for handwashing, rain and brief accidental splashes, but it isn't intended for swimming, showering or 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 BY1035-56E 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.
