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The Citizen Sky AT8391-52H Promaster Sky features a light-coloured dial that lends the watch’s many functions a fresh and technical look. The case and metal strap are made of titanium, ensuring the watch remains comfortably light on the wrist despite its extensive features.
With a diameter of approximately 40.5 mm, the size remains practical for everyday use. Sapphire crystal protects the dial from scratches, whilst the various sub-dials provide information on, amongst other things, the chronograph, time zones and additional calendar functions. It is precisely the combination of a light-coloured dial and dark details that ensures the individual markings are clearly distinguishable from one another.
Inside, it features Citizen’s H800 technology. The watch can receive radio-controlled signals from different parts of the world and automatically correct the time whenever reception is possible. This is particularly useful for those who value accuracy and do not wish to constantly adjust the seconds themselves.
The world time function also makes it easier to switch to a different time zone whilst travelling. The perpetual calendar automatically takes into account months of varying lengths and leap years.
A chronograph, 24-hour display and energy-saving functions are also included. The watch is charged by light via Eco-Drive, eliminating the need for regular battery changes. With its robust water resistance, this is also a watch that doesn’t have to be confined to the office.
The AT8391-52H therefore particularly appeals to wearers who want a high level of functionality, but who also value the comfort and the distinctive look of titanium.

The watch strap on this timepiece can easily be shortened using the strap shortener we provide free of charge.
| Brand | Citizen |
|---|---|
| Article number | AT839-Zilver |
| Item ID | AT8391-52H |
| EAN Code | 4974374354402 |
| SKU | AT8391-52H |
| Men or women | Men's |
| Case material | Titanium |
| Case colour | Silver |
| Case diameter (without crown) | 40.5 mm |
| Case height | 10.4 mm |
| Weight | 89 grams |
| Dial colour | White |
| Date | Yes |
| Seconds hand | Yes |
| Chronograph | Yes |
| 24-hour display | Yes |
| Luminous | Yes |
| Glass | Anti-reflective sapphire glass |
| Waterproof up to | 10 ATM |
| Type of movement | Eco-Drive |
| Movement | Citizen H804 |
| Battery | CTL621F |
| Watch strap material | Titanium |
| Strap colour | Silver |
| Strap width | 20 mm |
| Watch strap length | 210 mm |
| Closure | Safety lock |
| Gift box | Yes |
| Warranty | 3 years |
| Details | Radio-controlled, Perpetual Calendar, Summer/winter time |
| Condition | New |