Seiko HBB001 Prospex Automatic 41.7mm 145th Anniversary Limited Edition

Reference: HBB001 (HBB001K1) | Limited Edition of 9,999 Pieces

A Heritage-Inspired Diver Icon Celebrating "Seiko Blue"

In celebration of Seiko's landmark 145th anniversary, the Prospex collection introduces a striking commemorative timepiece that honors decades of horological excellence. This limited-edition diver features vibrant blue accents meticulously inspired by "Seiko Blue"—a signature tone established by the brand in the 1960s and refined over generations to embody the very heart of Seiko's identity. The distinctive blue highlights trace the unidirectional rotating bezel and coat the seconds hand, creating an exceptional visual contrast against a clean, sophisticated silver-white dial.

Inheriting a legendary sports case design known for its straight, blade-like surfaces, this model achieves a sharper, more compact form factor on the wrist. The high-quality stainless steel case is paired with a solid, matching bracelet featuring elegant chamfering along the center links, ensuring a flawless finish that perfectly complements the watch's linear architecture. Equal parts historic milestone and robust tool watch, this 145th-anniversary release is a premier acquisition for serious collectors and everyday watch enthusiasts alike.

Reliable Automatic Performance Built for the Deep

Beneath the silver-white dial beats Seiko's dependable in-house Caliber 4R35 automatic movement, offering manual winding capability, a stop-second hand function for precise time setting, and a 41-hour power reserve. Built to true ISO diving standards, the watch features a robust 200-meter water-resistant case, a secure screw-down crown, and a screw case back engraved with its limited-edition status. The hands, hour indices, and bezel markers are heavily coated in LumiBrite for exceptional legibility in dark or underwater environments. The solid stainless steel bracelet is equipped with a high-grade three-fold clasp, a secure lock, push-button release, and a built-in wetsuit extender for seamless functionality.

Product Specifications

• Brand: Seiko

• Collection: Prospex Sea

• Reference Number: HBB001 / HBB001K1

• Release: Seiko 145th Anniversary Limited Edition (9,999 Pieces Worldwide)

• Movement: Caliber 4R35 Automatic (Self-winding with manual winding capacity)

• Power Reserve: Approximately 41 hours

• Jewels: 23

• Functions: Date window, stop-second hand hacking function

• Case Material: Stainless Steel

• Case Dimensions: 41.7mm Diameter | 12.3mm Thickness | 49.5mm Lug-to-Lug

• Dial Color: Silver-White with "Seiko Blue" Accents

• Crystal: Hardlex

• Luminescence: LumiBrite on hands, indices, and bezel

• Bezel: Unidirectional rotating diver's bezel

• Crown: Screw-down crown

• Water Resistance: 200 meters / 660 feet diver's

• Bracelet: Stainless steel solid bracelet with three-fold clasp, secure lock, push-button release, and extender

• Lug Width: 20mm

• Weight: 170.0 grams

• Case Back: Screw case back featuring "LIMITED EDITION" engraving