Seiko Prospex Speedtimer Automatic Chronograph Men's 42mm Watch HBD001J

The Seiko Prospex Speedtimer HBD001J is a mechanical chronograph based on a classic 1972 Speedtimer design. A textured sky blue dial is paired with black timing registers and a tachymeter scale, so the stopwatch readings are easy to tell apart from the time. The chronograph can time up to 12 hours. Inside is Seiko’s automatic Calibre 8R48. It winds as you move, can also be wound by hand, and has about 45 hours of power reserve. It uses a column wheel and vertical clutch, the same type of build found in high-end chronographs, which gives smooth pusher action and keeps the hands steady while timing. The 42mm stainless steel case has a super-hard coating and a dual-curved sapphire crystal, with LumiBrite on the hands and markers for low-light reading. Water resistance is 100 metres, so it copes with swimming and daily wear. The stainless steel bracelet has a three-fold clasp with push-button release, and the solid case back is screw-down. It’s a substantial, sporty watch that works for weekends, driving days and smart-casual outfits.