CITIZEN PROMASTER SKY NAVIHAWK NK0040-58L MECHANICAL SUPER TITANIUM MEN WATCH
NK0040-58L
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- 3 Years Warranty
Aviation instrumentation shapes every detail of the Citizen Promaster NK0040-58L. A blue sunray dial with applied indices, Arabic numerals and crisp red accents sits beneath a slide-rule bezel, giving the watch the purposeful look of a cockpit gauge. The entire 40mm case and bracelet are built in Citizen's Super Titanium, finished in a cool silver tone that keeps the pilot-watch character sharp without turning it into a tool-only piece.
Driving it is Caliber 8314, a mechanical automatic movement with 21 jewels running at 21,600 vibrations per hour. Wound by the motion of your wrist, it delivers approximately 60 hours of power reserve when fully wound — enough to sit through a weekend and still be running on Monday morning. A date display at three o'clock while Citizen rates the movement at -20 to +40 seconds per day, the normal tolerance for a mechanical calibre of this type.
The 40mm Super Titanium case measures 13.3mm thick and is protected by sapphire glass with shock protection and 200-metre water resistance specified by Citizen. The matching Super Titanium bracelet is 20mm wide and closes with a folding clasp, so the watch stays secure through travel, swimming and everyday wear.
At a Glance
- BrandCitizen
- CollectionPromaster
- MovementCaliber 8314 Mechanical Automatic
- Case Size40mm
- Thickness13.3mm
- DialBlue Sunray with Red Accents
- BezelSlide Rule
- GlassSapphire
- Case & BraceletSuper Titanium
- Water Resistance200m (20 BAR)
- Power ReserveApprox. 60 Hours
- CalendarDate Display
Why You'll Love It
- A dial that reads like an instrument: The blue sunray finish shifts with the light while applied indices, Arabic numerals and red accents keep the display clear and purposeful at a glance.
- Mechanical character, weekend-proof reserve: Caliber 8314 winds automatically from your wrist movement and holds approximately 60 hours of running time, so it is still ticking after a day or two off.
- A bezel with a job to do: The slide-rule bezel carries aviation calculation scales — a working feature drawn from Citizen's pilot-watch heritage rather than decoration.
- Super Titanium comfort for a 40mm sports watch: Case, bezel and bracelet are all Super Titanium, giving the watch a light, easy presence on the wrist across a full day.
- Built for real use: Anti-reflective sapphire glass, a screw-down case back, shock protection and 200-metre water resistance mean it handles travel, swimming and daily knocks without special care.
Key Features
- Caliber 8314 Mechanical Automatic — self-winding movement with 21 jewels, beating at 21,600 vibrations per hour.
- Approx. 60-Hour Power Reserve — running time from a full wind, without needing to be worn continuously.
- Slide-Rule Bezel — outer calculation scales in the aviation tradition.
- Blue Sunray Dial — applied indices, Arabic numerals and red accents.
- Date Display — calendar window at three o'clock.
- Super Titanium Case and Bracelet — Citizen's proprietary titanium material throughout.
- Screw-Down Case Back and Shock Protection — as specified by Citizen for this model.
- 200m Water Resistance — suitable for swimming and water recreation.
- 20mm Super Titanium Bracelet — secured by a folding clasp.
Technical Specifications
| Model Number | NK0040-58L |
| Collection | Citizen Promaster |
| Case Material | Super Titanium, Silver-Tone |
| Case Shape | Round |
| Case Diameter | 40mm |
| Case Thickness | 13.3mm |
| Bezel | Slide Rule |
| Glass | Sapphire Glass |
| Case Back | Screw-Down |
| Water Resistance | 200 Metres (20 BAR) |
| Dial Colour | Blue, Sunray Finish |
| Dial Accents | Red |
| Markers | Applied Indices with Arabic Numerals |
| Display Type | Analogue, Three Hands with Date |
| Calendar | Date Display at 3 O'Clock |
| Material | Super Titanium, Silver-Tone |
| Bracelet Width | 20mm |
| Clasp | Folding Clasp |
| Caliber | Citizen 8314 |
| Movement Type | Mechanical |
| Jewels | 21 |
| Frequency | 21,600 Vibrations per Hour |
| Power Reserve | Approximately 60 Hours When Fully Wound |
| Accuracy | -20 to +40 Seconds per Day |
| Functions | Hours, Minutes, Seconds, Date Display, Shock Protection |
Frequently Asked Questions
Does the NK0040-58L need a battery?
No. It is a mechanical automatic watch powered by Caliber 8314, which winds itself from the natural movement of your wrist. There is no battery and no light charging involved. If it has been sitting unworn, a few turns of the crown or some wrist movement will start it again.
How long will it run if I take it off?
Citizen specifies approximately 60 hours of power reserve from a full wind. In practice that means you can leave it off overnight or across a weekend and expect to find it still running, though you may need to check the time and date after a longer rest.
What is the slide-rule bezel used for?
A slide rule is the classic pilot-watch calculation tool. Its outer scales are used to work out conversions and flight-related sums such as distance and fuel figures. On this model it is a genuine functional scale rather than a decorative ring, in keeping with Citizen's Promaster aviation line.
How accurate is a mechanical watch like this?
Citizen rates Caliber 8314 at -20 to +40 seconds per day. That is the normal and expected tolerance for a mechanical calibre of this type, and actual daily rate will vary with how the watch is worn, wound and rested.
Can I swim with the NK0040-58L?
Yes. Citizen specifies 200 metres (20 BAR) of water resistance, which covers swimming and general water recreation when the watch is used according to Citizen's instructions. Avoid operating the crown while the watch is wet.
Will the 40mm case suit a slimmer wrist?
At 40mm across, this is a notably compact size for a pilot watch with a slide-rule bezel, and the Super Titanium construction keeps it comfortable. The case does stand 13.3mm tall, so it wears as a proper sports watch rather than a slim dress piece. We recommend trying it on in any City Chain store.
Does it show the date?
Yes. There is a date display at three o'clock. As with any mechanical watch, the date will need adjusting if the watch has stopped, and at the end of any month shorter than 31 days.
Can the Super Titanium bracelet be adjusted?
Yes. The 20mm Super Titanium bracelet can be sized by removing or adding links where compatible. City Chain Singapore offers in-store bracelet adjustment — please bring your warranty book with you.
What warranty is included?
This model comes with a 3-year warranty when purchased from City Chain Singapore, an authorised Citizen retailer. Keep your warranty documentation and proof of purchase for any future servicing.
Why Buy from City Chain Singapore
- Authorised Retailer100% genuine Citizen timepieces
- 3-Year WarrantyOfficial warranty coverage
- Free ShippingWithin Singapore
- Bracelet AdjustmentIn-store assistance
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Caliber No.: 8314
Movement: Mechanical
Strap: Super Titanium
Water Resistant: Water Resistant to 200m
Thickness: 13.3mm
Case Size: 40mm
Case: Super Titanium
Glass: Sapphire Glass
21 jewels
Date Display
Frequency : 21,600 vph
Running time of approx. 60 hours (when fully wound)
Shock protection
Delivery within Singapore | Order by 11AM
(Checkout options may vary depending on minimum order requirements)
• Free Standard Delivery (3 business days)
• Free Next Day Delivery
• Express Delivery at $30 (order by 2PM)
• Click & Collect (ready in 2–3 business days)
Weekend & Public Holiday Orders
Orders placed during this time will be processed on the next business day.
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.
