The Seiko HBC004J1 Prospex watch combines striking motorsport-inspired instrument design with robust functionality for demanding conditions.

Featuring a 39.5 mm stainless steel case with a hard coating, sapphire glass, and a black dial, it sits comfortably and securely on the wrist with a leather strap and safety folding clasp.

Powered by the 6R55 automatic caliber with a 72-hour power reserve, it includes a practical internal rotating bezel with countdown function and LumiBrite-coated markers for low-light visibility.

Key Features

Brand	Seiko
Model Number	HBC004J1
Collection	Prospex
Caliber	6R55
Movement	Automatic
Power Reserve	72 h
Precision	+25 / -15 sec. / day
Water Resistance	20 bar
Case Material	Stainless steel, hard coating
Glass Material	Sapphire
Case Size	39.5 mm
Thickness	11.95 mm
Lug Width	20 mm
Dial Color	Black
Luminescence	LumiBrite on indices and hands
Strap Material	Leather
Clasp Type	Safety folding clasp
Functions	Second stop feature, Manual winding possible, Date, Countdown

Highlights

Seiko 6R55 automatic movement with 72-hour power reserve
Internal rotating bezel with integrated countdown timer functionality
Scratch-resistant sapphire crystal and hard-coated stainless steel case
LumiBrite coating on hands and triangular index for dark visibility
20 bar water resistance for robust durability

Frequently asked questions

What caliber movement powers the Seiko HBC004J1?

It is powered by the Seiko 6R55 automatic caliber movement with manual winding capability and a stop-seconds function.

What is the power reserve of this watch?

The automatic movement provides a power reserve of approximately 72 hours.

What are the case dimensions and materials?

The watch features a stainless steel case with a hard coating measuring 39.5 mm in diameter, 11.95 mm in thickness, and a 20 mm lug width.

What type of crystal is used on the dial?

The watch is fitted with sapphire glass.

What is the water resistance rating?

The watch has a water resistance rating of 20 bar.

How does the countdown function work?

The watch features an internal rotating bezel with a countdown function to easily track time intervals.

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