The Story
The Seiko Prospex Alpinist SPB505 is the 2026 evolution of Seiko's iconic mountaineering field watch, refreshed with vintage-inspired details and modern engineering. The 39.5mm stainless steel case features Seiko's super-hard coating for enhanced scratch resistance, measures 12.7mm thick with a 46.4mm lug-to-lug span. The archive-inspired matte black dial showcases cathedral-style hands, classic Arabic numerals, wedge-shaped indices, and the traditional italic Alpinist signature beneath the Seiko logo. A rotating inner compass bezel and magnified date window honor the collection's outdoor heritage. Powered by the in-house Caliber 6R55 automatic movement with approximately 72 hours of power reserve and manual winding capability, the watch is accurate to +25/-15 seconds per day. The see-through caseback bears the Alpinist mountain emblem. Sapphire crystal with magnifier and anti-reflective coating on the inner surface. Water resistant to 200 meters.
Details & Craftsmanship
Every detail has been carefully considered to bring you the perfect product.
Details & Craftsmanship
Every detail has been carefully considered to bring you the perfect product.
Details & Craftsmanship
Every detail has been carefully considered to bring you the perfect product.
Details & Craftsmanship
Every detail has been carefully considered to bring you the perfect product.
Description
The Seiko Prospex Alpinist SPB505 is the 2026 evolution of Seiko's iconic mountaineering field watch, refreshed with vintage-inspired details and modern engineering. The 39.5mm stainless steel case features Seiko's super-hard coating for enhanced scratch resistance, measures 12.7mm thick with a 46.4mm lug-to-lug span. The archive-inspired matte black dial showcases cathedral-style hands, classic Arabic numerals, wedge-shaped indices, and the traditional italic Alpinist signature beneath the Seiko logo. A rotating inner compass bezel and magnified date window honor the collection's outdoor heritage. Powered by the in-house Caliber 6R55 automatic movement with approximately 72 hours of power reserve and manual winding capability, the watch is accurate to +25/-15 seconds per day. The see-through caseback bears the Alpinist mountain emblem. Sapphire crystal with magnifier and anti-reflective coating on the inner surface. Water resistant to 200 meters.
