The Seiko Prospex HBB003K1 is a high-performance Japanese automatic diver's watch. It belongs to the Prospex Sea Collection. It's globally recognized as the 2026 Asia-Pacific Limited Edition. Seiko restricted production to just 2,500 pieces worldwide. This model scales down the classic "Samurai" angular case. It delivers a highly wearable 41.7mm footprint. Watch communities call it the "Golden Hour", "Yellow Samurai", or "Shog-Urai". It earns these names for its textured yellow dial and black dive bezel. It unites a sharp stainless steel case with a high-contrast analog face. You'll find Hardlex crystal glass and an in-house Japanese automatic engine inside. It weighs 170.0 grams. It provides a solid feel for active individuals who need a reliable tool watch.

The main visual feature is the "Golden Hour" Sand-Textured Yellow Dial. The dial has a gritty sand-like texture. It uses a bright yellow hue inspired by coastal sunsets. A unidirectional rotating black dive bezel surrounds the face. Broad sword-style hands and applied hour markers use LumiBrite luminous compound. This ensures clear visibility deep underwater. A practical date window sits at 3 o'clock. The back features a solid screw-down caseback. It's engraved with the Seiko Tsunami wave emblem. You'll also see the "LIMITED EDITION" text and its unique serial number.

The watch uses Seiko’s rugged in-house Caliber 4R35 automatic movement. This 23-jewel mechanical engine winds itself through your wrist's motion. It also supports manual hand-winding and a stop-seconds hacking function. The movement operates at 21,600 vibrations per hour. It delivers a power reserve of roughly 41 hours.

The case features razor-sharp "Samurai" proportions. It measures 41.7mm in case width. It has a 49.5mm lug-to-lug length and a 12.3mm thickness. Dial protection comes from impact-resistant flat Hardlex crystal glass. The solid case structure and screw-down crown secure a certified 200-meter Diver's water resistance rating. It adheres strictly to ISO 6425 standards for scuba diving. The timepiece includes an integrated solid stainless steel bracelet. It uses a three-fold deployment clasp with a push-button release. It includes a built-in diver's extension.

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