Seiko SRPH31K1

Seiko SRPH31K1

Movement: Automatic Seiko caliber 4R36 (with manual winding and hacking seconds)

Seiko Watch Corporation

Power reserve: ~41 hours

Seiko Watch Corporation

Case: Stainless steel

Size: 39.4 mm (more compact than other Seiko 5 Sports)

Seiko Watch Corporation

Thickness: ~13.2 mm

Seiko Watch Corporation

Crystal: Curved Hardlex (hardened mineral)

Seiko Watch Corporation

Water resistance: 100 m (10 ATM)

Seiko Watch Corporation

Strap: Nylon / Military NATO type

Case back: Transparent (movement visible)