Seiko Presage Open Heart Men's Automatic Watch SSA407J1 Brown Stinger

Contemplating Movement: Presage Brown Open Heart, Caliber 4R38

Collection

The Seiko SSA407J1 belongs to the Presage Open Heart line. The opening on the brown dial directly exposes the 4R38 caliber in motion—a visual signature that illustrates unfiltered mechanical watchmaking. 40.5 mm case, sapphire crystal, water-resistant to 50 m.

Case

Made of stainless steel, the case of the Seiko SSA407J1 measures 40.5 mm in diameter and 13.1 mm in thickness. The bezel is fixed. The dial is protected by a sapphire crystal, the most scratch-resistant, with anti-reflective treatment. The case back is exhibition (transparent), allowing observation of the movement in operation. Water resistance is 50 m, suitable for swimming and splashes.

Movement

The Seiko SSA407J1 is powered by the automatic caliber 4R38, offering a power reserve of approximately 41 hours. It incorporates hacking (stop-seconds for precise time setting) and manual winding, two conveniences absent in the previous generation's 7S26 caliber. The dial opening reveals the balance wheel and a portion of the gear train, making the mechanics directly observable on the wrist.

Bracelet

The leather strap of the Seiko SSA407J1, secured by a deployant clasp, complements the case with coherence. The lug width is 20 mm.

Supplied with: Storage box, presentation pad, user manual.