Product Description: The Seiko SPB531J1 is a striking limited-edition timepiece from the Prospex Alpinist series, dubbed “Night Sky.” Inspired by the deep blue night sky over the Matterhorn, it features a vertical-striped dark blue dial, gold cathedral-style hands, and applied indices, giving a refined field/dress hybrid look. Powered by Seiko’s 6R35 in-house automatic movement with manual winding, this watch delivers approximately 70 hours of power reserve. It includes a rotating inner compass ring operated via a secondary crown, sapphire crystal with magnifier, screw-down crown, and is water resistant to 200 meters. With stainless steel case and leather strap (plus a nylon strap in the box), this limited run of 3,000 pieces offers rugged utility and elegant design.
Key Features: • Brand: Seiko Prospex • Model: SPB531J1 (‘Night Sky’ European Limited Edition) • Movement: Automatic (Calibre 6R35), manual winding supported • Accuracy: +25 / -15 seconds per day • Power Reserve: ~70 hours • Jewels: 24 • Case Material: Stainless steel • Case Diameter: 39.5 mm • Case Thickness: 13.2 mm • Lug-to-lug (Length): ~46.4 mm • Dial Color: Dark blue with vertical stripe texture • Crystal: Sapphire, with magnifier (date window) • Coating: Inner anti-reflective coating on crystal • Bezel: None outer; inner rotating compass ring (via crown at 4 o’clock) • Strap / Bracelet: Deep blue calf leather + additional nylon strap • Lug Width: 20 mm • Clasp: Three-fold clasp with push-button release • Water Resistance: 20 bar / 200 meters • Magnetic Resistance: ~4,800 A/m • Case Back: Exhibition / screw-in with limited edition number engraving • Limited Edition: 3,000 pieces only, Europe exclusive
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Seiko Prospex Alpinist ‘Night Sky’ SPB531J1 – Blue Dial Automatic 39.5 mm
