Seiko Prospex Speedtimer Mechanical: HBD001, HBD002, HBC003, and HBC004 Explained
Seiko added four Prospex Speedtimer Mechanical references: two caliber 8R48 chronographs (HBD001, HBD002) and two caliber 6R55 time-and-date watches (HBC003, HBC004), priced EUR 1,000 to EUR 2,780.