CITIZEN AT8300-58L PROMASTER ECO-DRIVE CHRONOGRAPH MEN WATCH
AT8300-58L
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- 3 Years Warranty
The Citizen Promaster Navihawk A-T is a flight-ready instrument built around radio-controlled timekeeping — the "A-T" stands for Atomic Timekeeping. The in-house Calibre H800 picks up atomic clock signals and keeps time to the second without you ever setting it, holding ±15 seconds a month on its own when out of signal range.
The deep blue pilot-style dial uses high-performance luminous hands and markers with no printed numerals — a clean, high-contrast layout built for quick legibility. An aeronautical slide-rule scale surrounds the display, operated by a second crown and used for fuel consumption and tank capacity calculations, with a date window at 3 o'clock for daily utility.
The 41mm silver-tone stainless steel case is just 11.62mm thick, with a screw-down crown, anti-reflective sapphire crystal, magnetic resistance and 200 metres of water resistance, on a sharply finished triple-link bracelet. Citizen built this line specifically to prove a full pilot's feature set didn't require a 43mm-plus case.
At a Glance
- BrandCitizen
- CollectionPromaster Navihawk A-T
- MovementCalibre H800 Eco-Drive
- TimekeepingRadio-Controlled (Atomic)
- Case Size41mm
- Thickness11.62mm
- DialDeep Blue
- Case FinishSilver-Tone Steel
- Slide RuleInternal, Second Crown
- Power ReserveApprox. 6 Months
- GlassSapphire, Anti-Reflective
- Water Resistance200m
Why You'll Love It
- Radio-controlled timekeeping means the watch syncs itself to atomic clock signals and stays accurate to the second. You never set it, and it corrects itself when you travel.
- Even with no signal available, the H800 calibre holds ±15 seconds per month on its own — accuracy doesn't depend on reception.
- The deep blue dial with no printed numerals is a genuinely clean pilot layout — high-contrast luminous markers do the work, which keeps it fast to read.
- An aeronautical slide-rule scale sits inside the crystal and is turned by a dedicated second crown, so it stays protected while remaining fully usable.
- This is a full-function pilot's watch in a 41mm case. Most watches carrying this feature set run 43mm or larger — Citizen built this line specifically to avoid that compromise.
- A perpetual calendar handles month lengths and leap years automatically, so the date and weekday never need correcting.
- No battery, ever. Eco-Drive runs on light with roughly six months of reserve, plus a power reserve display, overcharge prevention and a low-charge warning built in.
- Screw-down crown, anti-reflective sapphire crystal, magnetic resistance and 200m water resistance make this a properly engineered instrument rather than a styling exercise.
Perfect For
- Aviation & Pilot Watch Enthusiasts
- Frequent Travellers
- Atomic Timekeeping Fans
- Eco-Drive & Solar Watch Fans
- Blue Dial Collectors
- Full Function, Moderate Size
- Gift for Him
Key Features
- Radio-controlled (atomic) timekeeping — synchronises to atomic clock signals for second-level accuracy, with ±15 seconds per month when out of range.
- Internal aeronautical slide-rule scale — for fuel consumption and tank capacity calculations, operated by a second crown.
- Deep blue pilot-style dial — high-performance luminous hands and markers, no printed numerals.
- World time — with a chronograph and 24-hour reference.
- Perpetual calendar — with a date window at 3 o'clock and weekday display.
- Citizen Eco-Drive Calibre H800 — light-powered, approximately 6 months of power reserve.
- Power reserve display, overcharge prevention, low-charge warning and power-saving mode — the watch manages its own charge.
- 41mm silver-tone stainless steel case — 11.62mm thick, with two crowns and a screw-down main crown.
- Scratch-resistant, anti-reflective sapphire crystal.
- Magnetic resistance.
- Silver-tone triple-link stainless steel bracelet — 22mm width, fold clasp.
- 200-metre water resistance (20 BAR).
Technical Specifications
The Citizen Promaster Navihawk A-T AT8300-58L is a 41mm men's radio-controlled Eco-Drive chronograph powered by Calibre H800, synchronising to atomic clock signals and holding ±15 seconds per month without reception, with approximately 6 months of power reserve. The silver-tone stainless steel case measures 11.62mm thick with two crowns, a screw-down main crown, anti-reflective sapphire crystal, magnetic resistance and 200 metres of water resistance. The deep blue pilot-style dial carries high-performance luminous hands and markers with no numerals, a world time function, a chronograph, a perpetual calendar with weekday and a date window at 3 o'clock, small seconds and a power reserve display. An internal aeronautical slide-rule scale is operated by a second crown. It's finished on a silver-tone triple-link stainless steel bracelet with a fold clasp.
| Model Number | AT8300-58L |
| Collection | Promaster Navihawk A-T (Promaster Sky in Europe) |
| Case Material | Stainless Steel, Silver-Tone |
| Case Diameter | 41mm |
| Case Thickness | 11.62mm |
| Crowns | Two — Screw-Down Main, Second for Slide Rule |
| Bezel / Scale | Internal Aeronautical Slide Rule |
| Glass | Sapphire, Scratch-Resistant, Anti-Reflective |
| Magnetic Resistance | Yes |
| Water Resistance | 200 Metres (20 BAR) |
| Colour | Deep Blue |
| Markers | Luminous, No Numerals |
| Timekeeping | Radio-Controlled (Atomic) |
| World Time | Yes |
| Chronograph | Yes |
| Calendar | Perpetual — Date at 3 O'Clock, Weekday |
| Indicators | Power Reserve, Small Seconds |
| Material | Stainless Steel, Triple-Link, Silver-Tone |
| Width | 22mm |
| Clasp | Fold Clasp |
| Calibre | Citizen H800 |
| Type | Eco-Drive, Radio-Controlled |
| Accuracy (No Signal) | ±15 Seconds/Month |
| Power Reserve | Approx. 6 Months |
| Charge Management | Overcharge Prevention, Low-Charge Warning, Power-Saving Mode |
Best Matched With
- Flight Jacket
- Navy Blazer
- Technical Outerwear
- Dark Denim
- Travel Essentials
- Smart-Casual Weekend
Frequently Asked Questions
What does "A-T" mean?
A-T stands for Atomic Timekeeping. The watch receives time signals broadcast from atomic clocks and corrects itself automatically, keeping accuracy to the second without you ever setting it. Outside reception range it keeps time on its own to within about 15 seconds a month.
How does the internal slide rule work?
The aeronautical slide-rule scale sits inside the crystal rather than on an external bezel, and you turn it using a second crown on the side of the case. It's used for aviation calculations such as fuel consumption and tank capacity. Keeping it internal protects the scale and keeps the case profile clean.
Why does it have two crowns?
One crown handles the usual time and function setting; the second rotates the internal slide-rule scale. It's a standard arrangement on aviation watches with an internal bezel.
Why is the 41mm case notable?
Pilot's watches carry a lot of functions, so they usually end up at 43mm or larger. Citizen designed this line specifically to fit a full feature set — world time, chronograph, radio control and a slide rule — into a 41mm case, for people who want the capability without the size.
How does this compare to the green Promaster Sky?
Same Calibre H800, same 41mm case, same radio-controlled timekeeping and internal slide rule — the difference is finish. This version pairs silver-tone steel with a deep blue dial for a classic pilot look, while the AT8304-57W uses a black-coated case with a green dial for a darker, more tactical one.
What is a perpetual calendar?
A perpetual calendar automatically accounts for months of different lengths and leap years, so the date and weekday displays stay correct without you ever manually adjusting them at month-end.
How long does the charge last?
Approximately six months from a full charge with no further light exposure. A power reserve display on the dial shows you where you stand, and the movement includes overcharge prevention and a low-charge warning — the seconds hand jumps in two-second steps to tell you it needs light.
Is this a dive watch?
No — it's a pilot's watch from Citizen's Promaster aviation line, built around the slide rule, world time and radio-controlled timekeeping. The 200-metre water resistance means it handles swimming and snorkelling comfortably, but the watch is designed and equipped for flying rather than diving.
Will 41mm fit my wrist?
41mm sits comfortably in the modern men's range and suits most wrist sizes well — that's precisely the point of this model. At 11.62mm thick it's genuinely slim for a watch carrying this many functions.
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 AT8300-58L 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
Gift With Purchase
Free Promaster Travel Watch Pouch with every Citizen watch purchase. While stocks last.
Extra $15OFF with min. $200 spend
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Caliber: H800
Movement: Eco-Drive
Strap: Stainless Steel
Water Resistant: 200m
Thickness: 11.6mm
Case Size: 41mm
Case: Stainless Steel
Glass: Sapphire Glass
Maximum run time from full charge (Normal Use Condition): Approximately 6 months
Specification
24hrs, Date and Day Display
26 World Cities Time
Chronograph
Eco-Drive
Global Radio-Controlled
Insufficient Charge Warning Function
Luminous Hands and Index
Overcharge Prevention Function
Perpetual Calendar
Power Saving Function
Summer Time ON / OFF
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.
