SEIKO SRPG21 Automatic Dive Watch for Men – Prospex

Product Overview

The Seiko SRPG21 is a high-performance automatic dive watch from the renowned Prospex collection, built for men who demand precision, durability, and style in extreme conditions. Designed for adventurers and water sports enthusiasts, this Special Edition timepiece combines Seiko’s legacy of diving expertise with modern engineering. Its striking black dial features a deep 3D-pressed design that enhances legibility underwater, making it ideal for serious divers. Whether you’re exploring ocean depths or navigating daily challenges, this watch delivers reliable performance with a bold, professional look. Crafted to meet ISO standards for scuba diving, it’s a trusted companion for underwater exploration and everyday wear.

Key Features

• Automatic 23-Jewel Movement: Powered by a self-winding mechanical movement that beats at 21,600 vibrations per hour, ensuring accurate timekeeping. The movement can be manually wound or automatically charged through natural wrist motion, with a power reserve of approximately 41 hours—ideal for extended use between wears.
• LumiBrite Hands and Markers: The dial features Seiko’s proprietary LumiBrite technology, which provides superior brightness and long-lasting glow in low-light or underwater environments. Unlike traditional luminous paints, LumiBrite charges quickly and remains visible for hours, enhancing safety during night dives or low-visibility conditions.
• Magnified Date Calendar: A date window at the 3 o’clock position includes a magnification lens for easy reading, even at a glance. This practical feature ensures quick access to the date without compromising the watch’s clean, functional design.
• Black Ceramic Uni-Directional Bezel: The elapsed timing bezel is crafted from scratch-resistant black ceramic and rotates in one direction only, preventing accidental overestimation of dive time—a critical safety feature for underwater timing. Its precise 60-minute markings allow divers to track immersion duration accurately.
• Anti-Reflective Sapphire Crystal: The front crystal is made of durable sapphire with an anti-reflective coating, offering exceptional scratch resistance and clear visibility in bright sunlight or underwater. This premium material ensures long-term clarity and protection against impacts.
• Screwdown Crown and Caseback: Both the crown and caseback are securely screwed down to maintain water resistance and protect the internal movement from moisture, dust, and pressure changes. This design is essential for maintaining integrity at depth.
• Deep Blue Silicone Strap: The flexible, water-resistant silicone strap in a deep blue finish provides a secure and comfortable fit, even when wet. It resists saltwater corrosion and UV degradation, making it ideal for prolonged marine use.

Technical Specifications

• Model Number: SRPF79
• Collection: Prospex
• Movement: Automatic (self-winding), 23 jewels, 21,600 vph frequency
• Power Reserve: Approximately 41 hours
• Water Resistance: 200 meters (20 bar) – ISO certified for scuba diving
• Case Material: Stainless steel
• Bezel: Black ceramic, uni-directional rotating with elapsed time markings
• Crystal: Anti-reflective sapphire
• Dial: Black with 3D-pressed texture, LumiBrite hands and markers
• Strap: Deep blue silicone
• Closure: Buckle
• Crown: Screwdown
• Caseback: Screwdown stainless steel
• Dimensions: 4 x 4 x 5 inches
• Weight: 1.1 pounds
• Battery: 1 Lithium Ion battery (included)
• Department: Men
• Manufacturer: Seiko
• ASIN: B08WK4FJM8
• Date First Available: February 13, 2021

Benefits & Use Cases

The Seiko SRPG21 is engineered for real-world diving and outdoor activities. Its 200-meter water resistance and ISO compliance make it suitable for recreational scuba diving, snorkeling, and swimming. The uni-directional bezel and LumiBrite markers ensure accurate timing and visibility in dark or murky waters. The durable stainless steel case and sapphire crystal withstand harsh marine environments, while the silicone strap offers comfort during long dives. Beyond diving, its rugged design and professional appearance make it a versatile choice for travel, sports, or everyday wear. Whether you’re exploring coral reefs or navigating urban landscapes, this watch delivers reliability and confidence.

Important Notes

While the watch includes a Lithium Ion battery, it primarily operates as an automatic mechanical movement and does not rely on the battery for timekeeping. The battery may support additional functions or initial activation. For detailed warranty coverage, customers should refer to the manufacturer’s official policy. The product dimensions and weight reflect the packaged item. Always ensure the crown and caseback are fully tightened before water exposure to maintain water resistance. Regular maintenance by a certified watch technician is recommended to preserve performance and longevity.