SEIKO PROSPEX HBC004J1 SPEEDTIMER MECHANICAL MEN WATCH

Seiko HBC004J1 — Prospex Speedtimer Mechanical Automatic

The Seiko HBC004J1 is the leather-strap variant of the Prospex Speedtimer Mechanical — sharing the same 6R55 automatic calibre with 72-hour power reserve, the same 39.5 mm stainless steel case, the same curved sapphire crystal, the same rotating inner ring, the same LumiBrite, the same date, and the same 200 m water resistance as the bracelet-equipped HBC003J1, but with a blue grey dial and a black leather strap instead of a light blue dial and a stainless steel bracelet. The blue grey dial creates a darker, more subdued presence that reads as more serious and more versatile than the HBC003J1's brighter light blue — it pairs with both formal and casual wear without the colour drawing attention to itself.

Key Features

• Seiko 6R55 automatic calibre — 72-hour power reserve, hand-winding capability, screw case back, Made in Japan (J1)
• Three-hand analogue display with date — clean, focused dial layout
• Blue grey dial — a darker, more subdued tone than the HBC003J1's light blue
• Rotating inner ring — internal bezel ring for elapsed-time tracking or personalised reference marking
• 39.5 mm stainless steel case — compact, sport-forward proportions
• Curved sapphire crystal — premium scratch resistance with a contoured profile
• LumiBrite on hands and hour markers — full low-light legibility
• 200 metres water resistance — professional-grade water resistance for swimming, snorkelling, and active use
• Black leather strap — lighter on the wrist, warmer, and more dressy than a steel bracelet
• Screw case back — sealed for water integrity under pressure

Why You'll Love It

The HBC004J1 is the Speedtimer Mechanical for the buyer who wants a darker dial and a lighter, warmer wearing experience. The blue grey dial is more versatile than the HBC003J1's light blue — it reads as quietly sporty without the colour statement, sitting comfortably in both office and weekend contexts. The black leather strap makes the watch lighter on the wrist and more comfortable in warm weather than a steel bracelet, and at a lower price point than the bracelet version. Same 6R55 calibre, same 72-hour reserve, same curved sapphire, same rotating inner ring, same 200 m WR — the same Speedtimer Mechanical in a different material and colour mood.

HBC004J1 vs HBC003J1

Both share the same 6R55 calibre with 72-hour reserve, same 39.5 mm case, same curved sapphire, same rotating inner ring, same LumiBrite, same date, and same 200 m water resistance. The HBC004J1 has a blue grey dial with a black leather strap — the darker, more understated, lighter-wearing option. The HBC003J1 has a light blue dial with a stainless steel bracelet — the brighter, sportier, all-metal option. Same Speedtimer Mechanical, two material personalities.

The Seiko Story

Since 1881, when Kintaro Hattori founded a clock and watch shop in Ginza, Tokyo, Seiko has been at the forefront of timekeeping innovation — from the world's first quartz wristwatch in 1969 to today's GPS Solar and Spring Drive technologies. Seiko's Prospex (Professional Specifications) line carries a legacy of precision instruments built for extreme environments. The Speedtimer name has been part of Seiko's motorsport heritage since 1969, and the HBC004J1 carries it forward as a mechanical three-hand watch — the Speedtimer concept in its most refined, leather-strap expression.

Backed by Seiko's official warranty. Authentic Seiko Prospex, sold by authorised retailer City Chain Singapore.

Explore more Seiko Prospex, browse the full Seiko collection, or see all Men's watches at City Chain Singapore.

Extra $15OFF with min. $200 spend
Use Code: 15FORYOU

Extra $30OFF with min. $400 spend
Use Code: 30FORYOU

Calibre Type: Automatic - Powered By The Movement Of The Wearer
Calibre Function: Analogue - 3 Hands
Power Reserve/Battery Life: Approx. 72 Hours Power Reserve
Battery: N/A
Calibre Number: 6R55
Display: Analogue
Water Resistance: 200 Metres
Case Material: Stainless steel
Case Size (Diameter): 39.5mm
Case Color: Silver
Band/Bracelet: Strap - Leather
Band Color: Black
Glass Material: Curved sapphire crystal
Crown: Pull Out
Rotating Bezel: Rotating Inner Ring
Dial Color: Blue Grey
Hand Indicators: Hour, Minute, Seconds
Calendar Indicators: Date
Lumibrite: Hands & Hour Markers
Hand Winding Capability: Yes
Screw case back: Yes

Delivery within Singapore | Order by 11AM
(Checkout options may vary depending on minimum order requirements)

• Free Standard Delivery (3 business days)
• Free Next Day Delivery
• Express Delivery at $30 (order by 2PM)
• Click & Collect (ready in 2–3 business days)

Weekend & Public Holiday Orders
Orders placed during this time will be processed on the next business day.

For online purchase, you can have bracelet or leather strap adjustments done at any City Chain store. Please bring along your warranty book for the service.