This is an automatic dive watch from Seiko's Prospex line, produced in collaboration with PADI (Professional Association of Diving Instructors). Known as the "Turtle" due to its cushion-shaped case, this particular reference—SRPA21—was first introduced around 2016 as part of Seiko's ongoing commitment to affordable yet professional-grade dive instruments.

The stainless steel case measures approximately 45mm in diameter, featuring a brushed finish with polished accents, and is complemented by a unidirectional rotating bezel with a distinctive red and blue "Pepsi" color scheme. The coin-edge bezel offers firm grip for timing underwater excursions, aligning with the model's ISO 6425 certification for professional dive watches.

The deep blue sunburst dial is adorned with bold round and trapezoidal luminous hour markers, ensuring high legibility in low-light conditions. The hands are generously lumed, with the minute hand finished in a vivid red to comply with dive legibility standards. The day-date display is situated at 3 o'clock, enclosed in a beveled frame, while the PADI logo is prominently printed above the 6 o'clock marker.

Powering the watch is the Seiko in-house Caliber 4R36, a robust self-winding movement with hacking and hand-winding capabilities. Beating at 21,600 vibrations per hour, it offers a power reserve of approximately 41 hours. The screw-down crown and caseback contribute to a water resistance rating of 200 meters.

This example comes on the original Seiko stainless steel bracelet with a secure fold-over clasp and diver's extension. The watch is in excellent condition with minimal signs of wear, retaining crisp brushing on the lugs and sharpness in the case profile.

BRAND
Founded in 1881 and responsible for numerous technical innovations, Seiko revolutionized horology with the first quartz wristwatch in 1969. Its Prospex line continues the brand's legacy of rugged utility, offering purpose-built timepieces trusted by professionals. The PADI collaboration underscores Seiko's dedication to underwater exploration, merging tool-watch functionality with iconic, recognizable design.
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