SRPK43 Seiko Automatic Watch

A Darker Turtle, Refined for Depth

We present the Seiko Prospex SRPK43, part of Seiko’s Black Series line. This “King Turtle” diver version reimagines one of Seiko’s iconic dive styles with a fully blacked-out aesthetic hard-coated stainless steel, ceramic bezel, and a matte dark grey dial designed for visibility and rugged performance. It’s less about flash, more about function in low-light and underwater conditions.

Movement & Power

Under the hood beats Seiko’s Caliber 4R36, a 24-jewel automatic movement running at 21,600 vibrations per hour. It offers about 41 hours of power reserve, with manual winding and hacking seconds—useful when precise synchronization matters.

Built for the Deep

The SRPK43 is ISO compliant for scuba diving. It features:

• 200 m water resistance, with screw-down crown and case back.
• A black ceramic uni-directional rotating bezel for reliable dive timing.
• Sapphire crystal with an anti-reflective coating on the inside to reduce glare and improve legibility.

Design & Wearability

• Case / Dimensions: About 45 mm in diameter, 13.22 mm thick, with a lug-to-lug length of approximately 47.7 mm.
• Bracelet & Lugs: Hard-coated stainless steel bracelet, matching the black case, with 22 mm lug width. Secured via a tri-fold clasp with release lock and diver’s extension.

Lume & Visibility Features

Seiko has introduced Green LumiBrite Pro for this watch: lume designed to be brighter and longer lasting, especially in dark environments. The dark grey dial is fitted with highly legible markers and hands, all coated for strong glow; the bezel pip also features lume. A magnified day/date display completes the dial.