Citizen Promaster Sky AT8304-57W Men's Watch Black/Green • Eco-Drive Radio-Controlled • Sapphire Crystal

The Citizen Promaster Sky AT8304-57W is a versatile men's wristwatch combining cutting-edge technology with functional pilot's design. The Eco-Drive calibre H800 charges via light and synchronises with atomic clocks worldwide — in Europe, Japan, the USA and China. With a power reserve of 180 days, this watch is a reliable everyday companion, with no battery changes required.

The stainless steel case, 41 mm in diameter and 11.62 mm thick, houses an analogue chronograph with an extensive feature set: 24-hour display, perpetual calendar, stopwatch function up to 60 minutes with 1/20-second precision, and world time for 26 cities. The inner rotating flight-computer bezel enables calculations such as fuel consumption and tank capacity, operated via a second crown at the 8 o'clock position. The green dial with baton indices is protected by sapphire crystal with anti-reflective coating. A solid stainless steel bracelet with a secure double push-button clasp completes the sporting look. Water-resistant to 200 m and antimagnetic, the AT8304-57W is a true professional companion.

Key Features of the Citizen AT8304-57W Watch

• Eco-Drive Calibre H800 with worldwide radio time synchronisation (EUR, JPN, USA, China) and a 180-day power reserve — no battery changes needed.
• Analogue chronograph with perpetual calendar, world time for 26 cities, and an integrated flight-computer bezel for aviation calculations via a second crown.
• Sapphire crystal with anti-reflective coating, antimagnetic and water-resistant to 200 m for maximum durability in daily life and travel.

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: Harsh chemicals, 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 it 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.