Citizen Promaster Sky Navihawk NK0040-58L Watch

Citizen Promaster Sky Navihawk NK0040-58L Watch

The Citizen Promaster Sky Navihawk NK0040-58L is an automatic aviator watch with a 40 mm Super Titanium case and bracelet. Its blue dial is the feature that sets it apart from the black Navihawk: where the black one is a modern cockpit tool, the blue one recovers the tone of classic navigation instruments. It houses the Citizen 8314 calibre, a mechanical movement with a 60-hour power reserve, and offers 200 metres of water resistance.

The case is 13.3 mm thick and weighs 104 g. The crystal is anti-reflective sapphire and the crown is screw-down. The case back is also screw-down and transparent, so the 8314 calibre can be seen in operation. The bezel is bidirectional rotating and carries the printed slide-rule scale, with the same markers as the rest of the Navihawk collection.

The bracelet is solid Super Titanium, with a double-pusher clasp with safety. The lug width is 20 mm. The 20 bar water resistance covers swimming and water sports, but it is not intended as a professional dive watch. The 104 g weight on a 40 mm titanium translates into a sense of lightness that doesn't match its presence on the wrist.

The blue of this Navihawk is not the blue of a dress watch: it is the blue of 1970s navigation instruments, the one used on aviation watch dials before black became the default colour. When you turn the bezel to calculate consumption or a conversion, the deep blue of the dial keeps the hands and scales legible without the aggressive contrast of black with DLC. It is the same gesture navigators made before GPS, and it still works without a battery, without a signal and without a screen. You do it on a watch that doesn't need batteries or sunlight: the movement of your wrist keeps it running. It is the Navihawk for those who want the flight tool with the colour of classic aviation, without giving up a proper automatic.

Automatic 8314 Calibre 60-Hour Power Reserve Super Titanium Slide-Rule Bezel 20 ATM Sapphire 104 g

Why choose this watch?

Blue dial: the colour of classic aviation

The deep blue of this dial recalls the navigation instruments of the 70s, not a generic sports watch. It is the feature that sets the NK0040-58L apart from the black Navihawk, which is more instrumental and has a DLC bezel.

Slide-rule bezel: the tool that doesn't need batteries

The rotating bezel allows you to calculate consumption, distance and unit conversion. It is the feature that has defined the Navihawk since its origin, and in this version it coexists with an automatic movement, something Citizen rarely offers in its aviation line.

8314 calibre with 60-hour power reserve

The Citizen automatic movement offers 60 hours of running once charged. That covers a weekend without wearing the watch and places it above many entry-level automatics.

Super Titanium and 104 g: professional tool lightness

The Super Titanium case and bracelet keep the weight at 104 g. It is a 40 mm watch with aviator presence, but it doesn't feel heavy on the wrist.

200 m and screw-down crown: real use without extreme care

The 20 bar water resistance and screw-down crown allow swimming and water sports. It is not a dive watch, but it covers sports use with room to spare.

Technical specifications

Movement and functions

• Type: mechanical automatic.
• Calibre: Citizen 8314 (Miyota 8314).
• Power reserve: approximately 60 hours.
• Frequency: 21,600 vibrations per hour.
• Jewels: 21.
• Accuracy: -20 / +40 seconds per day.
• Functions: hours, minutes, seconds, date and slide-rule bezel.

Dial and indications

• Colour: blue.
• Numerals: Arabic and baton indices.
• Hands: with luminous material.
• Date: at 3 o'clock.

Case and dimensions

• Reference: NK0040-58L.
• Brand: Citizen.
• Collection: Promaster Sky Navihawk.
• Target: men.
• Material: Super Titanium (treated titanium).
• Diameter: 40 mm.
• Thickness: 13.3 mm.
• Weight: 104 g.
• Crown: screw-down.
• Case back: transparent, screw-down.
• Water resistance: 20 bar (200 m).

Crystal, bezel and bracelet

• Crystal: anti-reflective sapphire.
• Bezel: bidirectional rotating, slide-rule.
• Bracelet: solid Super Titanium.
• Clasp: double pusher with safety.
• Lug width: 20 mm.

Frequently asked questions

What is the slide-rule bezel and what is it for?

It is a rotating bezel with logarithmic scales that allows you to multiply, divide and convert units. In aviation it is used to calculate fuel consumption, distance, speed or altitude. In everyday life it serves to convert miles to kilometres, euros to another currency or calculate a tip. It is not decorative: it is an analogue calculation tool.

Does the blue dial look good in person or is it too dark?

The blue of this Navihawk has a deep tone that, under artificial light, looks sober and easy to read. Outdoors in direct light, the blue brightens and the hands and indices gain contrast. It is not a fluorescent blue nor a pastel blue: it is the blue of classic navigation instruments, designed to maintain legibility without the aggressive contrast of black with DLC.

Can you swim with it?

Yes. The water resistance is 20 bar (200 m), which covers swimming, snorkelling and water sports. It is not intended for professional scuba diving, but for recreational use it is more than enough. The crown is screw-down, which reinforces the seal.

What is the difference with the black Navihawk (NK0044-57E)?

The main difference is the dial colour and the bezel finish: blue on this NK0040-58L, black with grey DLC on the NK0044-57E. The movement, case, bracelet and bezel are the same. The blue recovers the tone of classic aviation; the black with DLC has a more instrumental and modern look.