- Titanium case Lightweight and gentle on skin
- Solar powered Charged by light – no battery changes
- Radio controlled Sets itself to the exact time automatically
Citizen Promaster Sky AT8390-55E • Men's Watch
Black • Radio-Controlled Chronograph • Super Titanium
Model: AT8390-55E
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Citizen Promaster Sky
Description
The Citizen Promaster Sky AT8390-55E is a technically sophisticated men's watch designed for use in the air and on the ground. At its heart is the light-powered Eco-Drive calibre H804 with radio synchronisation, automatically aligning itself with time signal transmitters and running indefinitely without a battery change thanks to solar technology. The Super Titanium case measuring 40.5 mm in diameter impresses with its low weight combined with exceptional scratch resistance, courtesy of Citizen's proprietary Duratect surface-hardening technology. An anti-reflective sapphire crystal protects the distinctive multi-layered dial with yellow and red accents, whose sense of depth is reminiscent of cockpit instruments and head-up displays. Water resistance to 10 ATM makes the AT8390-55E a versatile companion for active use. The integrated chronograph with tachymeter bezel completes the pilot DNA of this model. The matching titanium bracelet keeps the overall weight of the watch to a minimum, ensuring comfortable wear on the wrist.
The Citizen Promaster Sky AT8390-55E combines high-performance technology with a distinctive aviator design, appealing to men who seek a robust, precise and low-maintenance timepiece.
Key Features of the Citizen AT8390-55E
- Radio-Controlled Solar Drive: Eco-Drive calibre H804 with worldwide radio synchronisation and a power reserve of 6 months (up to 2 years in power-saving mode) — no battery changes required.
- Super Titanium: Case and bracelet crafted from surface-hardened titanium, lighter than steel and highly scratch-resistant thanks to Duratect technology.
- Chronograph with Tachymeter: Full chronograph function and tachymeter bezel for precise timekeeping and speed measurement — true to pilot logic.
Care instructions
Care Instructions for Wristwatches
Care & Cleaning
- Daily: Wipe case and bracelet with a soft, dry cloth to remove dirt and perspiration.
- Water-resistant watches: Clean with mild soapy water and a soft brush, rinse, dry thoroughly.
Important: Screw the crown down firmly beforehand!!! - Not water-resistant: Clean only dry or slightly damp, do not use water or cleaning agents.
- Avoid: Aggressive agents, perfume, cosmetics and heat.
- Leather straps: Do not soak, clean only slightly damp and allow to dry away from heat.
- Water resistance: Do not wear in the shower or bath, have tested annually.
- Battery (quartz): Have a depleted battery replaced immediately.
- Mechanical watches: Service by a master watchmaker every 5 years.
Storage & Handling
- Store the watch separately, not in direct contact with other jewellery (risk of scratching).
- Place mechanical watches on a flat surface when winding, do not leave the crown pulled out.
Specifications
All details of the Citizen AT8390-55E at a glance.
Basic data
- Target group
- Men
- Manufacturer
- Citizen
- Model series / Collection
- Promaster Sky
- Model number
- AT8390-55E
- EAN / GTIN
- 4974374354365
- Display type
- Analog
- Water resistance in bar
- 10
- Colour
- Black
- Other features
- Radio-controlled time signal reception, tachymeter, chronograph, Eco-Drive Solar
Case & Construction
- Case material
- Titanium
- Case colour
- Black
- Case diameter in mm
- 4,05
- Case shape
- Round
- Bezel material
- Tachymeter
- Watch glass
- Sapphire crystal
- Crown
- Screw-down crown
Dial & Display
- Dial colour
- Black
- Numerals & Indices
- Bar index
- Second hand
- Yes
Movement & Drive
- Drive type / Movement
- Radio-controlled
- Calibre / Movement
- H804
- Date display
- Yes
- Stopwatch function
- Yes
- Power reserve in minutes
- 6 Monate (2 Jahre im Energiesparmodus)
Strap & Clasp
- Strap material
- Titanium
- Strap colour
- Black
Questions about this product?
We're happy to help.Shipping & returns
Shipping
We ship with DHL GoGreen; large items such as grandfather clocks are sent by freight carrier.
Shipping costs for your country are shown in the cart.
Returns
You have 100 days to try your order at your leisure. If something isn't right, simply send it back.
CITIZEN – Watches for everyone, since 1918
When the first Citizen watch appeared in 1924, it was a small revolution: precise timekeeping for everyone – not just for a privileged few. The name said it all: Citizen, for the people.
Today, Citizen stands for innovative wristwatches with technologies like Eco-Drive, which charge using light. The philosophy remains: 'Better Starts Now' – now is the right moment to make things better.
Shop worry-free & securely
Whether for yourself or as a gift: We guarantee 100% genuine products from renowned manufacturers. Your order will leave our premises insured and will reach you the very next business day.
Should the piece not fit perfectly, take advantage of our generous 100-day return policy – uncomplicated and free of charge. Experience for yourself why over 13,000 customers have found their timepieces with us.
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