Picture a classic car cruising a coastal highway with the windows down. That is the mood Seiko built into the Prospex Speedtimer HBD001: a mechanical chronograph with a sky-blue dial, a blue chronograph hand and a serious movement underneath.

Born on the Racetrack

The HBD001 is based on Seiko's Speedtimer chronographs from the early 1970s, the era when a watch on a driver's wrist was as much a tool as a stopwatch on the pit wall. The modern version keeps that motorsport spirit and adds the contemporary build quality of the Prospex line.

The sky-blue dial, with its embossed pattern and blue accents, is the star. Differently finished subdials keep the layout high-contrast and easy to read, and a tachymeter scale is there for anyone who wants to measure speed over a known distance.

Inside: Caliber 8R48

The Caliber 8R48 is an automatic chronograph that can also be wound by hand. It runs at 28,800 vibrations per hour with 34 jewels and about 45 hours of power reserve. The chronograph measures up to 12 hours and is built around a column wheel and a vertical clutch, with a three-pointed hammer reset system.

In practice the vertical clutch means a chronograph hand that starts smoothly and without the small stutter of older designs, with less wear and better power reserve retention while the chronograph is running. Seiko lists accuracy at +25 / -15 seconds per day, and the movement is stop-second capable, so you can set the time precisely.

Case and Bracelet

The 42mm stainless steel case has a super-hard coating and vertical brushing, with a dual-curved sapphire crystal and anti-reflective coating on the inner surface. A screw-down caseback and 10 bar (100m) water resistance make it a dependable daily watch, and LumiBrite on the hands and indexes keeps it readable in the dark.

The multi-row steel bracelet closes with a three-fold push-button clasp and fits 20mm lugs. At 49.5mm lug-to-lug, the case is shaped to sit comfortably on the wrist.

Seiko Prospex Speedtimer HBD001 Specifications

Care and Final Thoughts

As an automatic, the HBD001 winds itself as you wear it; if it has been resting, a few turns of the crown will get it going. Rinse it after salt water, wipe the bracelet with a soft cloth, and have the movement serviced by an authorized service centre at regular intervals.

The Speedtimer HBD001 pairs vintage racing character with a proper mechanical chronograph at a price that stays in reach. If you want a blue-dial chronograph that looks as good at a car meet as it does at dinner, this is the one.