CITIZEN NJ0240-55L MECHANICAL MEN WATCH
NJ0240-55L
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- 3 Years Warranty
The Citizen NJ0240-55L is a mechanical watch without the price that usually comes attached. Caliber 8210 is an automatic movement — no battery, no quartz — that winds itself from the motion of your wrist and runs for approximately 40 hours once fully wound. It is one of the more accessible ways into mechanical watchmaking.
The dial is blue, with Roman numerals at 12 and 6 and clean baton markers everywhere else. It is a conservative layout by design: three hands, a date display, and nothing else competing for attention. The 40mm stainless steel case sits on a matching bracelet, giving it the range to work under a shirt cuff on a weekday and on its own at the weekend.
The movement runs at 21,600 vibrations per hour on 21 jewels — Citizen's 82-series has been in production for years and is known for being durable and straightforward to service rather than for chasing specifications. At 11.6mm thick with mineral glass and 50 metres of water resistance, it is built to be worn rather than kept aside.
At a Glance
- BrandCitizen
- CollectionMechanical
- MovementCaliber 8210 Automatic
- Jewels21
- Case Size40mm
- Thickness11.6mm
- DialBlue
- DisplayThree-Hand, Date
- Frequency21,600 vph
- Power ReserveApprox. 40 Hours
- GlassMineral
- Water Resistance50 Metres
Why You'll Love It
- A genuine automatic movement at an accessible price. There is no battery and no quartz module — the watch is driven by a mainspring wound by the motion of your wrist, which is the same operating principle as watches costing many times more.
- Caliber 8210 has been in production for years. Citizen's 82-series built its reputation on durability and being straightforward to service, which is exactly what you want in a first mechanical watch.
- Roman numerals at 12 and 6 with batons elsewhere is a restrained touch — enough to give the dial character without the fussiness of a full set of numerals.
- The blue dial reads as a dark neutral in most light and shows its colour when it catches the sun. It works with grey, navy and brown equally well.
- Three hands and a date, and nothing else. No sub-dials, no extra hands, nothing to learn — the watch tells you the time and the date and gets out of the way.
- 40mm sits in the middle of the men's range and suits most wrists, large enough to read at a glance without dominating.
- A full stainless steel case and bracelet handle daily wear without special care, and City Chain sizes the bracelet for you in-store.
- 50-metre water resistance is uncommon on a mechanical watch at this level and covers handwashing, rain and everyday splashes without concern.
- Nothing to replace and nothing to run down. A mechanical watch that has been serviced properly can run for decades, which is a different proposition from a watch with a battery in it.
Perfect For
- First Mechanical Watch
- Automatic Watch Collectors
- Office & Business Casual
- Everyday Wear
- Blue Dial Collectors
- Steel Bracelet Fans
- Graduation Gift
- Japanese Watchmaking
Key Features
- Citizen Caliber 8210 automatic movement — self-winding mechanical movement with 21 jewels, running at 21,600 vibrations per hour with a power reserve of approximately 40 hours when fully wound.
- No battery required — the mainspring is wound by the natural motion of your wrist as you wear it.
- Three-hand display with date — hours, minutes and a central sweeping seconds hand, plus a date display on the dial.
- Blue dial with Roman numerals at 12 and 6 — baton markers at the remaining hours for a clean, uncluttered layout.
- 40mm stainless steel case — 11.6mm thick, silver-tone finish.
- Matching stainless steel bracelet — silver-tone, resizable by adding or removing links.
- Mineral glass — covers and protects the dial.
- 50-metre water resistance (5 BAR) — rated for handwashing, rain and everyday splashes.
Technical Specifications
The Citizen NJ0240-55L is a 40mm men's automatic watch powered by Caliber 8210, a self-winding mechanical movement with 21 jewels running at 21,600 vibrations per hour and holding approximately 40 hours of power reserve when fully wound. The stainless steel case measures 11.6mm thick with mineral glass and is water resistant to 50 metres. The blue dial carries three hands with a central sweeping seconds hand, Roman numerals at 12 and 6, baton markers elsewhere, and a date display. It requires no battery and is finished on a matching silver-tone stainless steel bracelet.
| Model Number | NJ0240-55L |
| Case Material | Stainless Steel |
| Case Diameter | 40mm |
| Case Thickness | 11.6mm |
| Case Shape | Round |
| Case Finish | Silver-Tone |
| Glass | Mineral |
| Water Resistance | 50 Metres (5 BAR) |
| Colour | Blue |
| Markers | Roman Numerals At 12 & 6, Batons Elsewhere |
| Hands | Three-Hand, Central Sweeping Seconds |
| Display | Hours, Minutes, Seconds, Date |
| Material | Stainless Steel, Matching Case |
| Colour | Silver-Tone |
| Caliber | Citizen 8210 |
| Type | Automatic (Self-Winding Mechanical) |
| Jewels | 21 |
| Frequency | 21,600 vph |
| Power Reserve | Approx. 40 Hours (Fully Wound) |
| Battery | Not Required |
| Gender | Gent |
Best Matched With
- Grey Wool Suit
- White Oxford Shirt
- Brown Leather Shoes
- Navy Knitwear
- Dark Denim
- Tan Chinos
Frequently Asked Questions
What does automatic mean?
An automatic watch is mechanical — driven by a coiled mainspring rather than a battery. A weighted rotor inside the case turns as your wrist moves, winding the mainspring as you go. Wear it regularly and it keeps itself running.
What happens if I do not wear it for a few days?
It will stop. A full wind holds approximately 40 hours, so a watch left off the wrist over a weekend will typically have run down by Monday. Putting it back on and moving your wrist restarts it, after which you reset the time and date.
Does it need a battery?
No. There is no battery in a mechanical watch and nothing to replace. It does need periodic servicing over its lifetime — the lubricants inside the movement break down with use — but that is maintenance rather than a consumable.
How often should a mechanical watch be serviced?
Every few years is the general guidance, though it depends on how much you wear it and in what conditions. The signs to look out for are the watch losing or gaining noticeably more time than usual, or the power reserve shortening. Any City Chain outlet can arrange servicing — bring your warranty book along.
Is a mechanical watch as accurate as a quartz one?
No, and that is normal. Quartz watches are accurate to seconds per month; a mechanical watch is typically accurate to seconds per day and will need occasional resetting. What a mechanical movement offers instead is craftsmanship, longevity and the fact that it runs on nothing but a wound spring.
What does 21 jewels mean?
The jewels are synthetic sapphires set at the points inside the movement where parts rotate against each other. They are far harder than metal and reduce friction and wear, which is what allows a mechanical movement to run for decades. 21 is a standard count for a movement of this type.
What is 21,600 vph?
Vibrations per hour — how fast the balance wheel oscillates. At 21,600 vph the seconds hand advances six times per second, which is what gives a mechanical watch its characteristic sweep rather than the once-per-second tick of a quartz watch.
Can I swim with this watch?
The case is rated to 50 metres, which covers handwashing, rain and everyday splashes. It is not intended for swimming, diving or water sports. As with any watch, make sure the crown is fully pushed in before any contact with water.
What is mineral glass?
Mineral glass is hardened glass used to cover and protect the dial. It is the standard crystal across much of Citizen's range. Citizen's higher-tier models use sapphire crystal instead, which offers greater resistance to scratching.
Will 40mm fit my wrist?
40mm sits in the middle of the men's size range and suits most wrists well. At 11.6mm it has a little more depth than a slim dress watch, which is normal for an automatic — the movement needs the room for its winding rotor.
Is the bracelet adjustable?
Yes. The bracelet can be resized by adding or removing links, and 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 NJ0240-55L comes with a City Chain Singapore warranty when purchased from an authorised outlet. 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
- Warranty Included 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.
