Seiko Prospex Automatic "Turtle" SRP777 Eterna Madison Eight-Days With Eterna Spherodrive - Ref. 7720.41.53.1231 Spring Lock®: patented hairspring anti-shock

Spring Lock®: patented hairspring anti-shock system

BEZEL: 360° BI-DIRECTIONAL TURNING BEZEL

and is less affected by temperature variations

the watch starts counting steps automatically whenever the wearer begins walking

This iconic square design of the 5600 Series is now equipped with a metal-covered bezel

Seiko Prospex Automatic "Turtle" SRP777 Eterna Madison Eight-Days With Eterna Spherodrive - Ref. 7720.41.53.1231 Spring Lock®: patented hairspring anti-shockCaliber: 4R36 Movement: Automatic, Self Winding and Hand winding capability Case Material: Stainless Steel Case Band: Silicone Band Bezel: Rotating Bezel Glass: Hardlex Glass Case Back: Screw Case Back Crown: Screw down Crown Case Diameter: 45 mm Water Resistance: 200m Power Reserve: Approximately 41 hours Vibrations Per Hour: 21,600 Jewels: 24 Functions: Day Date Calendar