Citizen Watch: Promaster Marine Eco-Drive Diver Black BN0266-07E

Citizen Promaster Marine BN0266-07E: the solar professional diver's watch for everyday wear

The Citizen Promaster Marine Eco-Drive Diver Black BN0266-07E is a genuine diving watch designed around a 40.55 mm stainless steel case with ISO 6425 certification. Its black dial is complemented by a black unidirectional rotating bezel and a black strap, while its 20 bar / 200-meter water resistance makes the Citizen Promaster Diver suitable for scuba diving.

The Citizen Promaster Marine Eco-Drive Diver measures just 11.69 mm in thickness for an official European weight of 85 g. Its black dial features applied indices and highly luminescent hands, accompanied by a date window at 3 o'clock. An anti-reflective sapphire crystal protects the Promaster Marine Diver, while the screw-down crown and case back reinforce its tool-watch construction.

The Citizen Promaster Diver is powered by the Citizen E118 caliber, an Eco-Drive solar quartz movement capable of utilizing both natural and artificial light. Once fully charged, the caliber has a maximum power reserve of approximately 365 days and offers an announced accuracy of ±15 seconds per month. The E118 also includes a low-charge indicator, a quick-start function, and overload protection.

Finally, the Black Citizen Promaster Diver features a black polyurethane strap using BENEBiOL™ material, developed from plant-based raw materials and designed to offer high resistance for sports use. Its width is 20 mm and it secures with a pin buckle. The Promaster Marine Diver thus combines solar technology, diving certification, and a relatively compact format in a particularly versatile configuration.

Technical specifications

• Brand: Citizen
• Collection: Promaster
• Model: Promaster Marine Eco-Drive Diver Black
• Reference: BN0266-07E
• Movement: Eco-Drive Solar Quartz
• Caliber: Citizen E118
• Power reserve / autonomy: Approximately 365 days after full charge
• Accuracy: ±15 seconds per month
• Functions: Hours, minutes, seconds, and date
• Date: Window at 3 o'clock
• Case: 316L stainless steel
• Diameter: 40.55 mm
• Thickness: 11.69 mm
• Weight: 85 g 
• Crystal: Sapphire with anti-reflective coating
• Case back: Screw-down
• Dial: Black sunray, date at 3 o'clock
• Hands: Luminescent arrows
• Indices: Luminescent applied baton and dot indices
• Crown: Screw-down
• Bezel: Unidirectional rotating black bezel
• Strap: Black BENEBiOL™ polyurethane, material using plant-based components
• Strap width: 20 mm
• Clasp: Pin buckle
• Water resistance: 20 bar / 200 meters
• Certification: ISO 6425, certified diver's watch.
• Citizen warranty: 3 years

Why choose this watch?

The Citizen Promaster Marine Eco-Drive Diver Black BN0266-07E offers a genuine certified diver configuration: ISO 6425, 200-meter water resistance, screw-down crown, screw-down case back, unidirectional bezel, and anti-reflective sapphire crystal. At the same time, the E118 caliber provides the Promaster Marine Eco-Drive Diver with an autonomy of up to one year after a full charge, with no need for regular battery changes thanks to the Eco-Drive system.

The Citizen Promaster Marine Eco-Drive Diver also stands out for its well-proportioned dimensions, versatile black dial, and matching strap. With a diameter of just 40.55 mm and a thickness of under 12 mm, the Promaster Marine Diver BN0266-07E remains versatile enough for everyday wear while retaining the technical specifications of a true Citizen Promaster watch.

About the Citizen brand

Citizen is a Japanese watch manufacture that develops both its watches and its own movements. The brand is famously the creator of Eco-Drive technology, capable of transforming natural or artificial light into electrical energy stored in a rechargeable cell.

The Promaster collection includes Citizen's professional watches designed for diving, aviation, and outdoor activities. With the Citizen Promaster Marine Eco-Drive Diver, the brand combines its expertise in solar movements with ISO 6425 certified construction. The Promaster Marine Eco-Drive Diver BN0266-07E illustrates this approach with its E118 caliber, 365-day power reserve, anti-reflective sapphire, and 200-meter water resistance.