Citizen Promaster Watch – Professional Diver Eco-Drive 300m

The Citizen Promaster BJ8055-04E, The BJ8055-04X (also known as the "Ecozilla") is an ISO-certified professional dive watch designed to withstand the most extreme underwater conditions. Powered by the Eco-Drive caliber B873 solar movement, it offers a power reserve of up to 6 months on a full charge. Its robust 48.2 mm case, screw-down crown, screw-down case back, and unidirectional bezel ensure maximum water resistance up to 30 bar (300 m). Anti-magnetic construction, crystal glass, and a blue rubber strap with a neoprene extension complete the package.

Technical specifications

• Movement: Eco-Drive, caliber B873, battery life ~ 6 months

• Housing: Stainless steel with black treatment (IP) / anti-magnetic black

• Diameter: 48.2 mm

• Thickness: 18.5 mm

• Waterproof rating: 300 m / 30 bar

• Glass: crystal glass (reinforced mineral glass)

• Bracelet: blue rubber/polyurethane, 32 mm wide (integrated)

• Functions: hour, minute, second, date at 3 o'clock

• Weight: 194 g

• Special features:

  • Unidirectional graduated telescope

  • Screw-on crown and screw-on base to ensure watertightness

  • Antimagnetic resistance

  • Extension strap included (for neoprene suits)

  • Certified to ISO 6425 as a professional diving watch