The Seiko Prospex Speedtimer Mechanical HBC004 is a three-hand motorsport watch with an unusual layout: the crown sits at 4 o'clock and turns an inner rotating countdown bezel instead of an outer one. It runs Seiko's 6R55 automatic movement with a 72-hour power reserve, hacking, manual winding and a date, in a 39.5 mm stainless steel case with dual-curved sapphire and 200 m water resistance. That makes it a compact, robust everyday watch for people who like racing timers but want something wearable. Against Speedtimer solar chronographs it trades stopwatch functions for a mechanical movement and a cleaner dial; against dive-style Prospex models it offers the countdown bezel and a slimmer case rather than a rotating dive scale. Owners rate it highly, and the main points of discussion are the 4 o'clock crown, the countdown bezel and the textile strap.
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Owners rate it 4.9 out of 5 and praise the build, the compact case and the 72-hour movement. The recurring talking points are the 4 o'clock crown and the inner countdown bezel, which some find less convenient than an outer bezel.
The Seiko Prospex Speedtimer Mechanical HBC004 is a three-hand automatic watch from Seiko's Prospex line, made with off-road motorsport in mind. It is powered by Seiko's own 6R55 automatic movement.
This reference has a crown at 4:00 that operates an inner rotating countdown bezel. The bezel is used to measure key intervals in motorsports competitions, such as the time remaining before the start and target durations for tasks like tire changes and refueling.
The case is stainless steel with a dual-curved sapphire crystal and a screwdown caseback. The dial is brushed blue, and the watch is worn on a textile strap with a stainless steel folding clasp.
