The Seiko 5 Sports SRPD51K1 is a robust and versatile automatic sports watch inspired by the iconic SKX diver series, featuring a striking blue sunray dial and unidirectional rotating bezel for timing activities, paired with a durable stainless steel bracelet for everyday wear. This model boasts a 42.5mm stainless steel case with brushed and polished finishes, a Hardlex crystal for scratch resistance, and a see-through screw-down case back to showcase the in-house movement. The blue dial includes luminous hands and indexes with LumiBrite for excellent low-light visibility, along with a day-date window at 3 o'clock. Powered by the reliable Caliber 4R36 automatic movement with hacking seconds and manual winding capability, it offers a 41-hour power reserve and 24 jewels for smooth operation. With 100 meters of water resistance and a screw-down crown, this timepiece blends classic dive-watch styling with modern functionality, making it ideal for casual adventures, sports, and daily use.
| Category | Details |
| Model | SRPD51K1 |
| Collection | 5 Sports SKX Series |
| Movement | Automatic Mechanical, Caliber 4R36 (24 jewels, 21,600 vph) |
| Accuracy | -35 to +45 seconds per day |
| Power Reserve | Approximately 41 hours |
| Functions | Hours, minutes, seconds, day-date (window at 3 o'clock), hacking seconds, hand-winding |
| Dial | Blue sunray, with LumiBrite luminous hands and indexes |
| Case Material | Stainless steel |
| Case Diameter | 42.5 mm |
| Case Thickness | 13.4 mm |
| Lug Width | 22 mm |
| Lug-to-Lug | 46 mm |
| Crystal | Hardlex |
| Case Back | See-through screw-down |
| Crown | Screw-down |
| Bezel | Unidirectional rotating, blue insert |
| Bracelet | Stainless steel, three-fold clasp with secure lock and push-button release |
| Water Resistance | 10 BAR / 100 meters / 330 feet (suitable for swimming and snorkeling) |
| Weight | 170 g |
| Additional Features | Magnetic resistance 4,800 A/m, EAN: 4954628232106 |
Seiko Dial Markings Note:
This Seiko watch has a "K" suffix, meaning it's built for international markets and assembled at Seiko's quality facilities outside Japan (e.g., Malaysia).
That's why the dial lacks "Made in Japan" or "Japan Movement"—standard for these models. It does not impact authenticity, quality, or performance.