Seiko SRPF77 Prospex Special Edition Blue Silicone Automatic Day Date Diver

Prospex “Dark Manta” Special Edition

The Seiko Prospex Special Edition SRPF77, nicknamed the “Dark Manta” or King Turtle “Save the Ocean,” pairs bold underwater performance with refined design. A gradient blue manta-ray dial with wave-pattern stamping captures the shifting light of the deep sea.

Rugged Diving Specifications

Housed in a 45mm stainless steel case (13.2mm thick, 47.7mm lug-to-lug) with a black ceramic uni-directional rotating bezel, the SRPF77 features a scratch-resistant sapphire crystal with anti-reflective coating for clear visibility under pressure. Built for serious diving, it delivers 200m water resistance and uses Seiko’s LumiBrite on the hands, hour markers, and bezel pip for low-light readability.

Reliable Automatic Movement

Powering the SRPF77 is Seiko’s in-house Caliber 4R36 automatic movement with 24 jewels, beating at 21,600 vph and offering approximately 41 hours of power reserve with manual winding and hacking. The day-date display sits at 3 o’clock under a cyclops magnifier, paired with a screw-down crown, solid screw-down caseback, and a deep blue silicone strap with a 22mm lug width.