Seiko Prospex Alpinist SPB505 Stainless Steel Black Dial Automatic Watch

The Seiko Prospex SPB505 is a refined yet rugged reinterpretation of Seiko’s legendary Alpinist field watch, engineered for adventurers and everyday wear alike. Featuring a classic black dial with bold Arabic numerals, a rotating inner compass bezel for outdoor navigation, and luminous hands and markers for enhanced visibility, this automatic timepiece blends heritage design with modern mechanical precision. Powered by Seiko’s reliable Caliber 6R55 automatic movement with approximately a 72-hour power reserve, the SPB505 delivers both durability and sophistication in a versatile 39.5 mm package.

Model: SPB505
Collection: Seiko Prospex Alpinist
Movement: Automatic with manual winding — Seiko Caliber 6R55 (~72-hour power reserve
) Accuracy: +25 to −15 seconds per day
Jewels: 24
Case Material: Stainless steel with super-hard coating
Case Diameter: 39.5 mm
Case Thickness: 12.7 mm
Lug-to-Lug: 46.4 mm
Crystal: Sapphire crystal with magnifier and anti-reflective coating on inner surface
Dial: Black with LumiBrite hands and indices
Bracelet: Stainless steel with three-fold clasp and push-button release
Lug Width: 20 mm Water Resistance: 200 m / 20 bar
Magnetic Resistance: 4,800 A/m
Additional Features:
- Rotating inner compass bezel
- Screw-down crown for enhanced sealing
- See-through & screw-down case back with iconic Alpinist mountain symbol