5 Sports SKX Series

The Seiko 5 Sports SKX Series is a 42.5 mm, 100 m water-resistant automatic watch with a mineral crystal.

Case: 42.5 mm
Water: 100 m (328 ft)
Movement: Automatic
Thickness: 13.9 mm

What the data says

Lighter than 52% of the 27 other watches we list in the 41–45 mm range.
Lowest in-stock price is 21% below list price this week.

Computed from the specs below. How we write summaries.

Full specs

Last verified Oct 5, 2026

Seiko’s own site doesn’t allow automated reading, so specs, prices and photos come from Long Island Watch’s product page (longislandwatch.com), a retailer that sells it. Unless marked otherwise, every spec is quoted from that page.

Case
Case diameter	42.5 mm
Thickness	13.9 mm
Lug to lug	46 mm
Lug width	22 mm
Weight (manufacturer)	0.22 lb (100 g)
Case	Stainless steel
Crystal	Mineral
Strap	Silicone, 22mm