SEIKO PROSPEX HBC003J1 SPEEDTIMER MECHANICAL MEN WATCH

Seiko HBC003J1 — Prospex Speedtimer Mechanical Automatic

The Seiko HBC003J1 is a mechanical Speedtimer from Seiko's Prospex collection — a three-hand automatic powered by the 6R55 calibre with a 72-hour power reserve, housed in a 39.5 mm stainless steel case with a curved sapphire crystal, a rotating inner ring, and 200 m water resistance. This is not a chronograph — the Speedtimer Mechanical takes the motorsport-inspired Speedtimer design language and distils it into a clean three-hand automatic with a rotating inner bezel ring that can be used for elapsed-time tracking or as a reference marker. The light blue dial with LumiBrite on hands and hour markers keeps things legible in any light, and the 6R55 calibre — the same movement found in the Presage Classic and Prospex Diver 300M — delivers the reliability of a 72-hour power reserve with +25/-15 seconds per day accuracy.

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
• Light blue dial with baton indices — fresh, contemporary colour in a motorsport-inspired case
• 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
• Stainless steel bracelet in silver — robust all-metal daily-wear package
• Screw case back — sealed for water integrity under pressure

Why You'll Love It

The HBC003J1 is the Prospex for the buyer who wants the 6R55's 72-hour power reserve and the Speedtimer's motorsport design language in a clean three-hand watch — no chronograph pushers, no sub-dials, just hours, minutes, seconds, date, and a rotating inner ring. The 39.5 mm case is more compact than the 41.4 mm solar Speedtimer chronographs and the 41.7 mm Prospex divers, making it the most wrist-friendly Prospex in the current range. The 200 m water resistance means it is built for genuine active use — swimming, snorkelling, and water sports — while the curved sapphire crystal and clean dial layout keep it refined enough for everyday wear. The same 6R55 calibre powers watches at higher price points in the Presage Classic line — the HBC003J1 delivers it in a sportier, more compact package.

HBC003J1 vs SPB481J1 (Diver 300M) vs SSC939P1 (Speedtimer Solar Chrono)

The HBC003J1 has the 6R55 automatic (72hr, 3-hand, rotating inner ring), 39.5 mm case, curved sapphire, and 200 m WR — the compact mechanical Speedtimer. The SPB481J1 has the same 6R55 but in a 41.3 mm diver's case with unidirectional bezel, 300 m diver's WR, and screw-down crown — the dive tool. The SSC939P1 has the V192 solar calibre with a 60-minute chronograph, tachymetre, 41.4 mm case, and 100 m WR — the motorsport timing instrument. Three Prospex watches, three different expressions of professional specification.

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 HBC003J1 carries it forward as a mechanical three-hand watch — the purest, most refined expression of the Speedtimer concept.

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.

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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: Bracelet - Stainless Steel
Band Color: Silver
Glass Material: Curved sapphire crystal
Crown: Pull Out
Rotating Bezel: Rotating Inner Ring
Dial Color: Light Blue
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.