The Seiko Prospex HBC003J1 combines classic motorsport design with robust functionality in a compact 39.5 mm stainless steel case. It features an anti-scratch coating and a sapphire crystal engineered to withstand demanding conditions.

Powered by the automatic Caliber 6R55 movement, this timepiece delivers a 72-hour power reserve and 20 bar water resistance. The precision is rated at +25 to -15 seconds per day.

An internal rotating bezel with a countdown function allows tracking of key intervals, while LumiBrite-coated triangular markers ensure readability in low light. The stainless steel bracelet is secured with a safety folding clasp.

Key Features

Brand	Seiko
Model Number	HBC003J1
Collection	Prospex
Movement	Automatic
Caliber	6R55
Power Reserve	72 h
Precision	+25 / -15 sec. / day
Water Resistance	20 bar
Case Material	Stainless steel
Case Size	39.50 mm
Case Thickness	11.95 mm
Lug Width	20 mm
Glass Material	Sapphire
Case Coating	Anti-scratch coating
Clasp Type	Safety folding clasp

Highlights

Movement: Caliber 6R55, Waterproofing 20 bar, Power reserve 72 h, Precision +25 / -15 sec. / day, Movement Automatique
Case: Case material Stainless steel, Glass Material Sapphire, Case Specification Anti-scratch coating, Case size 39.50 mm, Thickness 11.95 mm, Lug-width 20 mm
Bracelet: Clasp/Buckle type Safety folding clasp

Frequently asked questions

What movement powers this watch?

This watch is powered by the Seiko automatic Caliber 6R55 movement.

What is the power reserve of the watch?

The watch provides a power reserve of approximately 72 hours.

What are the dimensions of the case?

The stainless steel case has a diameter of 39.50 mm, a thickness of 11.95 mm, and a lug width of 20 mm.

What is the water resistance rating?

The watch features a water resistance rating of 20 bar.

What type of crystal is used on the dial?

The watch is fitted with a scratch-resistant sapphire crystal.

What type of clasp is fitted on the bracelet?

The bracelet features a safety folding clasp.

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