5 Sports Automatic GMT Watch

The Seiko 5 Sports Automatic GMT Watch is a 42.5 mm, 100 m water-resistant automatic watch.

Case: 42.5 mm
Water: 100 m (328 ft)
Movement: Automatic
Thickness: 13.5 mm

What the data says

Heavier than most watches its size: 81% of 27 comparable watches weigh less.
Lowest in-stock price is 15% 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	13.5 mm
Lug to lug	46 mm
Lug width	22 mm
Weight (manufacturer)	0.35 lb (161 g)
Case	Stainless steel
Strap	Stainless steel bracelet, deployant clasp

Toughness
Water resistance	100 m (328 ft)

Movement & features
Movement	Automatic
Caliber	Seiko 4R34
Display	Analog
Rotating bezel	Yes

Other
Colorways	Black Dial, Blue Dial, Orange Dial, Silver-White Dial, Yellow Dial, Green Dial, Grey Dial and Gold Accents, Grey Dial, Brown Dial
Warranty	2 years