Description

Seiko 5 Sports Field Series 41mm Automatic Watch — HDB009K
Built for the outdoors and styled for everyday wear, the Seiko 5 Sports Field Series HDB009K is a rugged automatic watch that delivers exceptional value without compromise. Powered entirely by the natural movement of your wrist, this 41mm field watch combines classic military-inspired design with the reliable engineering Seiko has been known for since 1881.

A Field Watch Built to Perform
The earthy brown dial and matching brown nylon strap give the HDB009K an authentic field watch aesthetic — equally at home on a hiking trail or a casual Friday. The one-way rotating bezel adds tactical functionality, while the built-in compass makes this a genuinely useful companion for outdoor adventures.
Legibility is never in question thanks to Lumibrite-coated hands and markers, which charge quickly in daylight and glow reliably in low-light conditions. The curved Hardlex crystal offers solid scratch resistance across everyday use, and 100 metres of water resistance means it handles everything from rain to reef swimming with ease.
Powered by Seiko’s Calibre 4R36
At the heart of the HDB009K is Seiko’s workhorse 4R36 automatic movement, delivering smooth three-hand analogue time with 41 hours of power reserve. The 4R36 also supports hand-winding — a thoughtful feature that lets you top up the reserve without needing to wear the watch. Flip it over and the exhibition case back puts the movement on full display, a satisfying detail for watch enthusiasts.
Day and date complications sit neatly on the dial, keeping you oriented without cluttering the design.

Why You’ll Love It
Self-winding automatic — no battery, ever
Compass + rotating bezel for outdoor navigation
Lumibrite lume for low-light legibility
Exhibition case back showcasing the movement
Lightweight at just 85g — wears all day with ease
Versatile brown nylon strap with 20mm lug width for easy strap swaps