Seiko Presage Open Heart Men's Automatic Watch SSA405J1 Blue Moon

Seiko Presage SSA405J1 Open Heart: Sapphire crystal, 40.5 mm, 41-hour power reserve

Collection

The Seiko SSA405J1 is part of the Presage collection with an open heart complication. The circular cutout on the dial reveals the balance wheel and a portion of the gear train, allowing observation of the movement in operation. Caliber 4R38 with a 41-hour power reserve, 40.5 mm case.

Case

The case of the Seiko SSA405J1 is made of stainless steel, with a diameter of 40.5 mm and a thickness of 13.1 mm. The bezel is fixed. The blue dial is protected by a sapphire crystal, the most scratch-resistant, with an anti-reflective coating. 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 SSA405J1 is powered by the automatic caliber 4R38, offering a power reserve of approximately 41 hours. It includes hacking (stopping the second hand for precise time setting) and manual winding, two conveniences absent on the previous generation 7S26 caliber. The dial opening reveals the balance wheel and a portion of the gear train, making the mechanics directly observable on the wrist.

Strap

The Seiko SSA405J1 is equipped with a leather strap, adding an elegant touch to this model, fastened by a deployant clasp, which makes it easy to put on and take off the watch while securing the strap to the wrist. The lug width is 20 mm.

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