CITIZEN’s PROMASTER line of professional sports watches offers superior functionality to ignite the imagination. The latest release from the PROMASTER line-up is the Eco-Drive Professional Diver 300 m equipped with the Cal. E365 movement that can run for an incredible 365 days on a full charge.

This new Professional Diver 300 m model, based on the popular CITIZEN PROMASTER Eco-Drive Diver, is a saturation diver’s watch equipped with a helium escape valve and water resistance up to 300 meters. The watch is powered by the Cal. E365 movement that keeps on running for 365 days on a full charge, even in the harshest environments and low-light conditions encountered by divers under the sea. This new model is based on the popular BN0156-05E and inherits many of its distinctive design elements including the crown and crown guard at the 4 o’clock position, the shape of the indices and the hour and minute hands, and the silhouette of the rotating bezel. The glossy dial is inspired by the dark hues of the deep sea with its subtle transition into a deeper shade of color toward the 6 o’clock position, producing a simple yet rugged look. The strap is made of BENEBiOLTM*2, a plant-based polyurethane. CITIZEN has adopted BENEBiOL for its straps as it is resistant to hydrolysis when exposed to moisture and has a lower impact on the environment.

An image of a diving helmet is pressed into the case back as a universal symbol recognizable to professional divers everywhere.

• Case / Band: Stainless steel / Biomass-based polyurethane (BENEBiOL™)/includes strap extension
  
• Glass: Sapphire glass with anti-reflective coating
  
• Case diameter / thickness: 46.0mm /16.3mmdesign specification only
  
• Specifications: Cal.E365 /Accuracy of ±15 seconds per month/Eco-Drive runs for one year on full charge
  ISO-standard diving water resistance to 300 m (Saturation Diving)
  Luminous (Hands and indices)One-Way Rotating Bezel Screw lock crown
  Recycled materials used for selected dial components