Citizen lists the Promaster Air Automatic Super Titanium NK0040-58L as a U.S. model with a 40 mm titanium case, blue dial, automatic movement, slide-rule bezel and 200 m water resistance. The listed U.S. price is $895. Citizen labels the product “New,” but its product page does not establish when the watch was announced or when it first became available in each region.
What Citizen lists for the NK0040-58L
The official U.S. product listing identifies this watch as a Promaster Air Automatic in Super Titanium. Its specifications are manufacturer-stated; they are not independent test results.
| Specification | Citizen’s listing |
|---|---|
| Model | NK0040-58L |
| Case diameter | 40 mm |
| Case material and finish | Super Titanium, silver tone |
| Bracelet | Super Titanium |
| Dial | Blue |
| Movement | Automatic Caliber 8310 |
| Power reserve | 60 hours |
| Display and functions | Three hands, date and hacking feature |
| Bezel | Outer slide-rule bezel |
| Crystal | Anti-reflective sapphire |
| Water resistance | 200 m / 20 bar |
| U.S. listed price | $895; availability and price may change |
What the aviation features do—and do not establish
Citizen describes the watch as “Engineered for aviation” and says it combines mechanical watchmaking with practical flight instrumentation. That is the manufacturer’s product-page wording. The listing names an outer slide-rule bezel, but does not explain its operation, so it is not possible to specify from that page which calculations it supports or how to perform them.
The aviation positioning should not be read as evidence that the watch is certified for flight use. The product information cited here provides no such certification or independent evaluation.
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- Modern, pilot-inspired Promaster timepieces equipped for professional use to discover the world from high above.
- Synchronized to Atomic Time Clock for Superior Accuracy, Atomic Timekeeping Technology with Synchronized Time Adjustment Available in 24 Time Zones, 1 Second Chronograph Measures up to 60 Minutes, Perpetual Calendar, 12/24 Hour Time, Alarm, Power Reserve Indicator, Day / Date
- Silver-Tone Stainless Steel
- Sapphire Crystal
- 200 Meters Water Resistant and 5 Year Limited Warranty
How it fits into the Promaster line
Citizen’s historical overview presents Promaster as its professional sports-watch family for land, sea and air. The NK0040-58L is identified specifically as a Promaster Air model.
It is distinct from the Promaster mechanical GMT watches Citizen Japan announced on January 19, 2024, with a scheduled January 25, 2024 release. Those watches are models NB6046-59E and NB6045-51H; their announcement date and GMT movement should not be attributed to the NK0040-58L.
Rank #2
- Modern, pilot-inspired Promaster timepieces equipped for professional use to discover the world from high above.
- Synchronized to Atomic Time Clock for Superior Accuracy, Atomic Timekeeping Technology with Synchronized Time Adjustment Available in 24 Time Zones, 1 Second Chronograph Measures up to 60 Minutes, Perpetual Calendar, 12/24 Hour Time, Alarm, Power Reserve Indicator, Day / Date
- Black Stainless Steel
- Sapphire Crystal
- 200 Meters Water Resistant and 5 Year Limited Warranty
What to consider before buying
The 40 mm case gives a useful starting point for judging size, but the listing alone cannot establish how it will fit a particular wrist. If possible, compare the dimensions with a watch you already wear or try it on. When assessing alternatives, compare case and bracelet material, movement and reserve, bezel functions, crystal, water-resistance rating and the price in your region.
Citizen’s U.S. page listed the NK0040-58L at $895 and displayed an add-to-cart option when accessed. That is a regional listing, not a guarantee of current stock or price elsewhere. The page establishes the model’s listed specifications and purchase availability at that time; it does not provide independent test results or market comparisons.
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Quick Recap
Best Value
- Modern, pilot-inspired Promaster timepieces equipped for professional use to discover the world from high above.
- Synchronized to Atomic Time Clock for Superior Accuracy, Atomic Timekeeping Technology with Synchronized Time Adjustment Available in 43 World Cities, 1/100 Second Chronograph Measures up to 24 Hours, Perpetual Calendar, Dual Time (Second Time Zone), 2 Alarms, 99-Minute Countdown Timer, Digital Backlight Display, Universal Coordinated Time (UTC) Display, Power Reserve Indicator
- Two-Tone Stainless Steel
- Ana-Digi Display;Luminous Hands and Markers. Anti-Reflective Sapphire Crystal
- 200 Meters Water Resistant and 5 Year Limited Warranty
Rank #4
- Modern, pilot-inspired Promaster timepieces equipped for professional use to discover the world from high above.
- Synchronized Atomic Timekeeping Technology with Synchronized Time Adjustment Available in 43 World Cities, Perpetual Calendar, Dual Time (Second Time Zone), 2 Alarms, 99-Minute Countdown Timer, Digital Backlight Display, Power Reserve Indicator
- Silver-Tone Stainless Steel
- Anti-Reflective Mineral Crystal
- 200 Meters Water Resistant and 5 Year Limited Warranty
Rank #3
- Modern, pilot-inspired Promaster timepieces equipped for professional use to discover the world from high above.
- An Eco-Friendly Evolution: Citizen launches first Titanium Watch in 1970. More than 50-year-old evolution of innovative timepieces crafted from proprietary space-age material.
- Benefits of Super Titanium: Lightweight for Better Comfort, Scratch Resistant, Gentle on Skin, and Rust Resistant. Five times harder and 40% lighter than stainless steel.
- Atomic Timekeeping Technology with Synchronized Time Adjustment Available in 43 World Cities, 1/100 Second Chronograph Measures up to 24 Hours, Perpetual Calendar, Dual Time (Second Time Zone), 2 Alarms, 99-Minute Countdown Timer
- Sustainably powered by any light, with our Eco-Drive technology this watch never needs a battery. 200 Meters Water Resistant and 5 Year Limited Warranty
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
