Seiko Prospex Save The Ocean King Turtle Automatic Diver’s
Product Overview
The Seiko Prospex Save The Ocean King Turtle Automatic Diver’s Watch (SRPF77K1) is a purpose-built timepiece designed for serious divers and watch enthusiasts who value precision, durability, and environmental awareness. Part of Seiko’s Save the Ocean collection, this model honors marine conservation while delivering professional-grade performance. It features a robust automatic movement, 200 meters of water resistance, and a bold blue dial inspired by ocean depths. Built for men who demand reliability in challenging conditions, this watch combines functional dive-ready features with a striking aesthetic rooted in oceanic heritage.
Key Features
- Automatic Movement with Caliber 4R36: Powered by Seiko’s reliable in-house 4R36 automatic movement, this watch self-winds with the motion of your wrist and includes 24 jewels for reduced friction and enhanced longevity. No battery changes are needed, ensuring consistent performance over time.
- 200M Water Resistance: Engineered for underwater use, this diver’s watch is suitable for recreational scuba diving, snorkeling, and water sports. The screw-down crown and screwed case back provide a secure seal against water intrusion.
- Sapphire Crystal: The dial is protected by scratch-resistant sapphire crystal, offering superior clarity and long-term durability compared to mineral or acrylic alternatives. Ideal for daily wear and harsh environments.
- Blue Dial with Luminous Display: The deep blue dial features high-contrast analog markers and hands filled with luminous material, ensuring excellent visibility in low-light or underwater conditions.
- Uni-Directional Rotating Bezel: The 60-minute graduated bezel rotates only counterclockwise to prevent accidental overestimation of dive time—a critical safety feature for divers.
- Day and Date Display: Conveniently positioned at the 3 o’clock mark, the day-date complication adds everyday utility without compromising the watch’s clean, functional layout.
- Stainless Steel Case and Silicone Strap: The 45mm stainless steel case offers strength and corrosion resistance, while the flexible silicone strap ensures a secure, comfortable fit during active use.
- Power Reserve: The movement includes a power reserve indicator, allowing you to monitor how much energy remains in the mainspring for uninterrupted operation.
- Screw-Down Crown and Case Back: These components ensure water tightness and protect the internal mechanics from dust and moisture.
- Buckle Clasp: The secure buckle closure keeps the watch firmly in place, even during vigorous movement or underwater activity.
Technical Specifications
- Case Material: Stainless Steel
- Strap Material: Silicone
- Movement: Automatic (Caliber 4R36)
- Jewels: 24
- Crystal: Sapphire
- Dial Color: Blue
- Display: Analog with Day and Date
- Bezel: Uni-Directional Rotating
- Crown: Screw-Down
- Case Back: Screwed
- Water Resistance: 200 meters (20 bar)
- Case Diameter: Approximately 45mm
- Case Thickness: Approximately 13mm
- Lug Width: Approximately 22mm
- Clasp: Buckle
- Power Reserve: Yes
- Luminous Features: Hands and Markers
- Battery: 1 unknown battery required (included)
- Item Model Number: SRPF77K1
- Department: Men’s
- Product Dimensions: 5.91 x 3.94 x 1.97 inches; 7.05 ounces
- Manufacturer: Seiko
- ASIN: B08WB23VXR
- Date First Available: February 7, 2021
Benefits & Use Cases
This watch is ideal for divers, outdoor adventurers, and anyone who values a rugged, functional timepiece with a purpose. Its 200-meter water resistance and dive-ready features make it suitable for recreational diving, swimming, and water-based activities. The luminous dial and rotating bezel support safe underwater timekeeping, while the automatic movement ensures reliability without battery dependency. The silicone strap provides comfort during extended wear, whether on land or in the water. As part of the Save the Ocean series, wearing this watch also supports marine conservation awareness, appealing to environmentally conscious buyers. Its bold 45mm case size suits larger wrists and makes a confident statement on the wrist.
Important Notes
This product includes one unknown battery (already installed). For warranty details, customers should refer to the manufacturer’s official policy. The watch ships in original packaging with standard Seiko documentation. While designed for diving, it should not be used for saturation or commercial diving beyond recreational limits. Regular maintenance and pressure testing are recommended for prolonged underwater use. Always ensure the crown and case back are fully secured before water exposure.
