CITIZEN NH8391-51Z

The Citizen NH8391-51Z is a men's automatic watch from the C7 series, distinguished by its vibrant yellow dial, 40.2 mm stainless steel case, and reliable Caliber 8200 movement with approximately 40 hours of power reserve. 

• Movement: Automatic, Citizen Caliber 8200, 21 jewels, with an accuracy of -20 to +40 seconds per day.
• Power Reserve: Approximately 40 hours on a full wind.
• Case Size: 40.2 mm in diameter.
• Case Thickness: 13.1 mm.
• Case Material: Stainless steel with a transparent, screw-closed case back.
• Dial: Yellow dial with luminous silver-tone hands and index markers.
• Crystal: Scratch-resistant mineral crystal glass (some retailers mention anti-reflective sapphire glass, but mineral crystal is most commonly cited across official and multiple merchant sites).
• Strap Material: Stainless steel bracelet with a deployment clasp and push-button release.
• Water Resistance: 50 meters (5 bar / 5 ATM), suitable for still water swimming but not recommended for diving or showering.
• Functions: Day and date display.
• Weight: 135g.