Citizen Promaster Sky Navihawk NK0044-57E Watch

Citizen Promaster Sky Navihawk NK0044-57E Watch

The Citizen Promaster Sky Navihawk NK0044-57E is an automatic aviator watch with a 40 mm Super Titanium case and bracelet. What makes it rare is not the bezel: it is that a Navihawk, Citizen's aviation line, has abandoned Eco-Drive to house a mechanical calibre. The result is a pilot's watch with a 60-hour power reserve, 200 metres of water resistance and a rotating slide-rule bezel that can calculate fuel consumption, distance or unit conversion.

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 has a grey DLC treatment and matches the black dial, which carries Arabic numerals and baton indices.

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 watch weighs 104 g, a figure that on a 40 mm titanium translates into a sense of lightness that doesn't match its presence.

The slide-rule bezel of this Navihawk is not decoration: it is the reason a pilot chooses this watch over a conventional chronograph. When you're in the cockpit and need to calculate fuel consumption for a leg, or when you want to convert nautical miles to kilometres, you turn the bezel, align the scales and read the result on the dial. 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, but also a proper automatic.

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

Why choose this watch?

Slide-rule bezel: the flight 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.

Not an Eco-Drive: it's an automatic aviator

Anyone looking for a solar or radio-controlled Navihawk won't find it here. This NK0044-57E is pure mechanical, and that is precisely what makes it a different piece within the collection.

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

Case and dimensions

• Reference: NK0044-57E.
• Brand: Citizen.
• Collection: Promaster Sky Navihawk.
• Target: men.
• Material: Super Titanium (treated titanium).
• Diameter: 40 mm.
• Thickness: 13.3 mm.
• Weight: 104 g (single source accepted).
• 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, with grey DLC treatment.
• 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 Super Titanium scratch easily?

Super Titanium is a titanium treated with surface hardening that makes it more scratch-resistant than conventional titanium. Even so, it is not indestructible: repeated rubbing against abrasive surfaces can leave marks. The advantage over steel is that it weighs less and does not cause allergies.

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 NK0040-58L?

The main difference is the dial colour: black on this NK0044-57E and blue on the NK0040-58L. The movement, case, bracelet and bezel are the same. The black version has the bezel with grey DLC treatment, which gives it a more instrumental and less striking look than the blue.