Seiko 5 SRPH31 Sports Field Automatic Blue Dial Nylon Band
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Product Description
Built for the Field
The Seiko SRPH31 brings military-inspired field watch design to the 5 Sports collection. With its blue dial, Arabic numeral markers, and comfortable nylon strap, this is a rugged everyday companion designed for outdoor adventures and urban exploration alike.
Design & Dial
The blue dial features a clean field watch layout with bold Arabic numerals and luminous hands treated with LumiBrite for reliable low-light visibility. The day-date window at 3 o’clock provides daily functionality, while the overall design keeps readability as the top priority — essential for a true field watch. The Seiko 5 shield at 12 o’clock anchors the military-inspired aesthetic.
Movement & Performance
The Caliber 4R36 automatic movement powers this field watch with 24 jewels and approximately 41 hours of power reserve at 21,600 vibrations per hour. Both hacking seconds and manual winding are included, allowing precise time setting in the field. The exhibition caseback reveals the decorated movement.
Case & Build
The 39.4mm stainless steel case provides a versatile size that works for any wrist. At 13.2mm thick, it maintains a comfortable profile for active wear. The curved Hardlex crystal follows the case contour, while 100-meter water resistance handles rain, splashes, and swimming with confidence.
Strap & Comfort
The blue nylon strap delivers lightweight comfort and rugged durability, ideal for field conditions and everyday wear. The 20mm lug width offers easy access to a wide range of NATO and nylon strap options for personalization.