The Seiko Presage SSA441J presents a mechanical automatic timepiece with an open-heart movement, meticulously crafted in Japan.Driven by the Seiko calibre 4R38, this watch offers both manual and self-winding automatic functionalities, maintaining a normal operating accuracy tolerance of 45 / -35 seconds per day and a power reserve of 41 hours. Encased within a 40.5mm stainless steel case with a thickness of 11.8mm, it features a stainless-steel bracelet adorned with matching hands and indexes.Enhanced by a box shape hardlex glass and a three-fold push button release clasp, this watch boasts a water resistance rating of 50m. Additional features include a screw case back, exhibition case back, and an open-heart movement, allowing glimpses of its intricate mechanics. The textured sunburst green dial, stainless steel hands and markers, and the captivating open-heart movement combine to create a striking visual contrast, epitomizing the elegance and craftsmanship of Seiko Presage.- Caliber No. 4R38- Automatic Movement – Powered by the movement of the wearer- 41 Hours Reserve - 40.5mm Case Size - 11.8mm Case Thickness - 135g Weight - Stainless Steel Case and Bracelet - Hardlex Glass - Pull Out Crown - 50 Meters Water Resistant - Exhibition Case Back