The Seiko Prospex HBB004K1 is a high-performance Japanese automatic diver's watch, standing proudly alongside its yellow HBB003 sibling within the renowned Prospex Sea Collection. Exclusively released as the 2026 Asia-Pacific Limited Edition, production is strictly capped at 2,500 pieces worldwide. Designed to echo the warm, fiery colors of a coastal sunset, this timepiece takes the iconic angular "Samurai" case architecture and scales it down to a highly wearable mid-size profile. Across international watch enthusiast circles and dive communities, it has earned defining community nicknames—the "Orange Samurai", "Sunset Shog-Urai", "Orange Hour", or "Asia-Pacific Orange LE"—for its vividly grained orange dial, high-contrast black dive bezel, and certified 200-meter water resistance. It unites a robust stainless steel case measuring 41.7mm in width (49.5mm lug-to-lug) with a luminous analog face, impact-resistant Hardlex crystal glass, an in-house Japanese automatic engine, and an integrated solid stainless steel bracelet. Weighing a substantial 170.0 grams, it is meticulously engineered for scuba divers, marine explorers, and bold individuals seeking a vibrant, dependable tool watch with genuine exclusivity.

The visual centerpiece of this HBB004K1 reference is its spectacular "Sunset" Sand-Textured Orange Dial. Inspired by fading light over the Pacific, the dial features a gritty, grained texture that adds immense depth to its bright orange hue. It is framed by a black unidirectional rotating bezel equipped with a luminous pip at 12 o'clock. The broad sword-style hands and applied geometric index markers are generously filled with LumiBrite luminous compound, ensuring maximum legibility in the darkest underwater environments. A practical date window is positioned at 3 o'clock. Turning the watch over reveals a solid stainless steel screw-down caseback, deeply engraved with the iconic Seiko Tsunami wave emblem, the "LIMITED EDITION" designation, and its unique individual serial number out of 2,500.

Beneath its vivid exterior, the watch is driven by Seiko’s proven in-house Caliber 4R35 automatic movement. This 23-jewel mechanical engine winds itself through the natural motion of the wearer’s wrist while also supporting manual hand-winding via the screw-down crown. It features a stop-seconds (hacking) function, allowing the seconds hand to be halted for precise time synchronization. Operating at a frequency of 21,600 vibrations per hour (3 Hz), it delivers a dependable power reserve of approximately 41 hours.

The case is engineered with razor-sharp "Samurai" proportions, measuring an official 41.7mm in case width (diameter), a lug-to-lug length of 49.5mm, and a profile thickness of 12.3mm. Dial protection is provided by a heavy-duty, scratch-resistant flat Hardlex crystal glass. Engineered as a true professional dive instrument, the solid case structure and screw-down crown secure a certified 200m / 660ft Diver's water resistance rating, adhering strictly to ISO 6425 standards for scuba diving (air diving). Additionally, it boasts magnetic resistance up to 4,800 A/m. The timepiece is completed on an integrated solid stainless steel bracelet (with a 20mm lug width) featuring a three-fold deployment clasp with a secure lock, push-button release, and a built-in diver's extension for comfortable wear over a wetsuit.

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