The Seiko HBC001J1 is powered by the 6R54 caliber, an automatic movement with a manual-winding option, a 72-hour power reserve, and a GMT function for managing two time zones. The stated accuracy ranges from +25 to -15 seconds per day.

The case, made of stainless steel, measures 42.00 mm in diameter, is 13.30 mm thick, and has a lug-to-lug distance of 20 mm. The watch features a rotating ceramic bezel, as well as a screw-down crown and case back to ensure professional water resistance up to 300 meters. The dial is protected by a sapphire crystal with an anti-reflective coating.

The green dial features hour markers and hands with a LumiBrite coating for excellent readability.

The bracelet is made of stainless steel and features a folding clasp with a micro-adjustment system for an optimal fit.

Watch accompanied by warranty and official Seiko packaging.