SEIKO PRESAGE Style 60's Open Heart Automatic SSA426J1

Caliber 4R39
    Vibrations: 21,600 vibrations per hour (6 beats per second)
    Power reserve: 41 hours
    Number of jewels: 24

Specifications
    Stainless steel case
    Glass: Box-shaped Hardlex
    Screw see-through case back
    Diameter: 40.8mm, Thickness: 12.8mm
    Weight : 140g
    Water resistance: 5 bar
    Magnetic resistance: 4,800 A/m
Band:  Nylon
Dial: Brown
One year International warranty