CITIZEN NJ0240-55A MECHANICAL MEN WATCH
NJ0240-55A
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- Backordered, shipping soon
- 20% off in cart
- 3 Years Warranty
The Citizen NJ0240-55A keeps things deliberately straightforward — a clean white dial with excellent legibility, no unnecessary complications, just honest time-and-date functionality with genuine mechanical character. It strikes a real balance between dress and sport: versatile enough for the office, refined enough for weekends.
Inside is Citizen's Calibre 8210 automatic movement — 21 jewels, 21,600 vibrations per hour, roughly 40 hours of power reserve. This is a widely-used, proven Citizen in-house movement, generally regarded as robust and easy to service rather than needing frequent attention.
The 40mm stainless steel case runs 11.6mm thick with a matching stainless steel bracelet, protected by mineral glass. Water resistant to 50 metres, this is a low-maintenance, everyday automatic built for long-term durability.
At a Glance
- BrandCitizen
- CollectionMechanical
- MovementCalibre 8210 Automatic
- Case Size40mm
- Thickness11.6mm
- DialWhite
- DisplayDate
- Case & BraceletStainless Steel
- GlassMineral Glass
- Power ReserveApprox. 40 Hours
- Water Resistance50m
Why You'll Love It
- The white dial keeps things clean and genuinely easy to read at a glance, without unnecessary complications cluttering the face.
- Calibre 8210 is a real automatic movement: no battery, wound by the motion of your wrist, with the mechanical character enthusiasts look for when moving up from quartz.
- This is a widely-used, proven Citizen in-house caliber, generally regarded as robust and easy to service — a sensible, low-maintenance choice rather than a finicky one.
- It genuinely strikes the balance between dress and sport — smart enough for the office, relaxed enough for weekends, without leaning too far in either direction.
- The all-steel case-and-bracelet build gives this real everyday durability that a leather strap can't match.
- At 40mm, it sits comfortably under a cuff without reading as oversized.
- No battery, ever. The movement runs on the motion of daily wear, so there's nothing to replace.
Perfect For
- Mechanical Watch Enthusiasts
- First Automatic Watch
- Steel Bracelet Fans
- Office & Smart-Casual
- Low-Maintenance Ownership
- Everyday Wear
- Gift for Him
Key Features
- White dial — clean, high-legibility layout without unnecessary complications.
- Citizen Calibre 8210 automatic movement — 21-jewel self-winding mechanical movement running at 21,600 vibrations per hour with approximately 40 hours of power reserve. No battery required.
- Date display — straightforward daily-wear function.
- Mineral crystal — over the dial, protecting against everyday scratches.
- 40mm stainless steel case — 11.6mm thick, round profile.
- Matching stainless steel bracelet — durable, everyday build.
- 50-metre water resistance (5 BAR) — rated for handwashing, rain and brief splashes. Not intended for swimming or diving.
Technical Specifications
The Citizen NJ0240-55A is a 40mm men's automatic watch powered by Calibre 8210, a 21-jewel movement running at 21,600 vph with approximately 40 hours of power reserve. The stainless steel case measures 11.6mm thick with mineral crystal over the dial and is water resistant to 50 metres. The white dial carries a date display, finished on a matching stainless steel bracelet.
| Model Number | NJ0240-55A |
| Case Material | Stainless Steel |
| Case Diameter | 40mm |
| Case Thickness | 11.6mm |
| Glass | Mineral Glass |
| Water Resistance | 50 Metres (5 BAR) |
| Colour | White |
| Display | Hours, Minutes, Seconds, Date |
| Material | Stainless Steel, Matching Case |
| Calibre | Citizen 8210 |
| Type | Automatic (Self-Winding) |
| Jewels | 21 |
| Frequency | 21,600 vph (6 beats/sec) |
| Power Reserve | Approx. 40 Hours |
Best Matched With
- Navy Blazer
- White Oxford Shirt
- Grey Wool Trousers
- Brown Leather Belt
- Smart-Casual Chinos
- Weekend Casual
Frequently Asked Questions
What does "automatic" mean?
An automatic watch is powered by the natural movement of your wrist. A rotor inside the case winds the mainspring as you wear it, so no battery is needed. If left unworn for about two days it will stop and need resetting — simply wear it again to restart it.
How long does the power reserve last?
Approximately 40 hours when fully wound, so the watch keeps running for close to two days after you take it off. Regular daily wear keeps it continuously wound.
How accurate is a mechanical watch?
Mechanical movements are not as precise as quartz by design — expect to reset the time every week or two. The appeal is the engineering and the absence of a battery rather than chronometer-level accuracy.
Does a mechanical watch need servicing?
Yes. Unlike a quartz watch, an automatic has moving parts and lubricants that wear over time. Citizen recommends periodic servicing to keep timekeeping and water resistance within spec. Any City Chain outlet can arrange this — bring your warranty card.
Can I swim with this watch?
No. With 50-metre (5 BAR) water resistance it's rated for handwashing, rain and brief accidental splashes, but it isn't intended for swimming, showering or diving.
Will 40mm fit my wrist?
40mm sits in the middle of the modern men's range and suits most wrist sizes from roughly 15cm to 19cm.
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 NJ0240-55A 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.: 8210
Movement: Mechanical
Jewels: 21 jewels
Frequency: 21,600 vibrations per hour (vph)
Power Reserve: Approx. 40 hours (fully wound)
Functions: Date Display
Case Size: 40mm
Case Thickness: 11.6mm
Case Material: Stainless Steel
Glass: Mineral Glass
Strap: Stainless Steel
Water Resistance: 50 metres
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.
