Seiko Prospex Alpinist Automatic Men's 39.50mm Watch SPB505J eofy2026 5mm case frames a sunray

5mm case frames a sunray light green dial

the GMA-S2100WS-7A features a slimmer and more compact profile that offers lightweight comfort while maintaining the strong visual identity of the G-SHOCK collection

travel and everyday wear

The textured turquoise dial features a bold black tachymetric scale and a triple-register chronograph layout

with a halo of Round Brilliant Cut Diamonds

Seiko Prospex Alpinist Automatic Men's 39.50mm Watch SPB505J eofy2026 5mm case frames a sunrayExperience precision, durability, and refined craftsmanship with this exceptional automatic timepiece, powered by the dependable 6R55 calibre. Driven entirely by the movement of the wearer, it offers an impressive 72 hour power reserve and reliable accuracy of +25 to 15 seconds per dayperfect for everyday performance. Crafted from robust stainless steel, the 39. 5mm case is engineered for versatility and endurance, boasting 200 metres of water