What does the grey dial represent

Dial: Green Dial with Medusa Head - 316L Stainless Steel Luminous Hour

black hands and markers and the famous red second hand

8mm profile and dependable Miyota quartz movement

Strap: Green calf leather

Citizen Men's Watch Eco-Drive Dive Silicone Strap 50mm What does the grey dialCitizen Eco Drive technology harnesses the power of light from any natural or artificial light source and converts it into energy which is stored in a rechargeable lithium ion cell. It recharges continuously in any kind of light to run forever. Caliber E168 Analog Quartz Power Reserve 180 Days. 44mm x 12mm Polished Brushed Stainless Steel Case Scratch Resistant Sapphire Crystal One Way Rotating Elapsed Time Bezel Screw Down Crown Solid Caseback. Green