SEIKO PROSPEX HBB004K1 2026 ASIA-PACIFIC LIMITED EDITION MEN WATCH

Seiko HBB004K1 — Prospex Sea 2026 Asia-Pacific Limited Edition Diver

The Seiko HBB004K1 is the second colourway in the 2026 Asia-Pacific Limited Edition diver's pair from Seiko's Prospex Sea collection — sharing the exact same 4R35 automatic calibre, the same 41.7 mm stainless steel case at 12.3 mm thick, the same Hardlex crystal, the same unidirectional rotating bezel, the same screw-down crown, the same screw case back with individual serial number and "LIMITED EDITION" marking, the same triple-coverage LumiBrite on hands, indexes, and bezel, 200m diver's water resistance as its sibling the HBB003K1. Limited to 2,500 pieces, each individually serial-numbered, the HBB004K1 offers the same professional dive-tool specification in a different colour expression.

Key Features

• Seiko 4R35 automatic calibre — 23 jewels, approx. 41-hour power reserve, manual winding, stop second hand for precise setting
• Date display — practical daily utility at the dial
• 41.7 mm stainless steel case — 12.3 mm thick, 49.5 mm lug-to-lug, 170 g
• Hardlex crystal — Seiko's proprietary hardened mineral glass for impact and scratch resistance
• Unidirectional rotating bezel — one-way rotation for safe elapsed-time tracking during dives
• Screw-down crown — seals the case for water resistance under pressure
• Screw case back — with "LIMITED EDITION" marking and individual serial number
• LumiBrite on hands, indexes, and bezel — triple-coverage luminescence for maximum underwater and low-light legibility
• 200 m (660 ft) diver's water resistance — For recreational and professional diving
• 4,800 A/m magnetic resistance — shielded against everyday magnetic fields
• Three-fold clasp with secure lock, push-button release, and diver's extender — wears securely over a wetsuit
• Limited to 2,500 pieces — Asia-Pacific exclusive for 2026

Why You'll Love It

The HBB004K1 delivers the same professional diver's specification as the HBB003K1 — 200 m ISO diver's rating, screw-down crown, screw case back, unidirectional bezel, triple-coverage LumiBrite — in a different colourway for the buyer who wants the same dive-tool capability with a distinct visual identity. Both models are limited to 2,500 pieces across Asia-Pacific, each individually serial-numbered, so the colourway choice also determines your collectible identity within the pair. Same specification, same exclusivity, different colour personality.

HBB004K1 vs HBB003K1

Both share identical specifications — same 4R35 calibre, same 41.7 mm case, same 12.3 mm thickness, same Hardlex, same unidirectional bezel, same 200 m diver's WR, same triple LumiBrite, same 4,800 A/m magnetic resistance, same 170 g, same clasp with diver's extender, same 2,500-piece limitation. The only difference is the colourway. If you want both colour expressions from the same limited-edition pair, the HBB003K1 is the other half.

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 that stretches back to the first Seiko diver's watch in 1965, worn by the Japanese Antarctic Research Expedition. The HBB004K1 continues that heritage as a 2026 Asia-Pacific exclusive — 200 m diver's capability, serial-numbered limited-edition provenance, and the reliability of the proven 4R35 automatic movement.

Backed by Seiko's official warranty. Authentic Seiko Prospex, sold by authorised retailer City Chain Singapore. Limited to 2,500 pieces — Asia-Pacific 2026 exclusive.

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

Extra $15 OFF with min. $200 spend
Use Code: FORYOU15

Extra $30 OFF with min. $400 spend
Use Code: FORYOU30

Caliber Number: 4R35
Movement Type: Automatic with manual winding
Power reserve: Approx. 41 hours
Jewels: 23
Stop second hand function
Date display
Case Material: Stainless steel
Case Thickness: 12.3mm
Case Diameter: 41.7mm
Lug-to-lug: 49.5mm
Crystal: Hardlex
LumiBrite on hands, index(es) and bezel
Three-fold clasp with secure lock , push button release with extender
Distance between lugs: 20mm
Water Resistance: 200m / 660ft diver's
Magnetic Resistance: 4,800 A/m
Weight: 170.0g
LIMITED EDITION on the case back
Serial number engraved on the case back
Unidirectional rotating bezel
Screw-down crown
Screw case back

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.