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SPB379

Seiko

SPB379 Mechanical GMT

Also sold as SPB379J1Japan

In production All SPB references →
Caliber
6R54
Case diameter
39.5mm
Water resistance
200 m
Power reserve
72h

Seiko SPB379: caliber 6R54, 39.5 mm case, 200 m water resistance.

Where to buy

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Specifications

Specifications from Seiko, Creation Watches, last seen 2026-09-21.

Movement

Caliber
6R54 All 6R54 watches →
Movement
Automatic
Power reserve
72h
Jewels
24

Case & crystal

Case material
Stainless steel (super hard coating)
Case diameter
39.5mm
Case thickness
13.6mm
Lug to lug
46.4mm
Lug width
20mm
Crystal
Curved sapphire crystal

Resistance

Water resistance
200 m
Magnetic resistance
4,800 A/m

Catalogue

Family
SPB
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Variants Same watch, different market or bracelet

Reference Edition Region Band Clasp Weight
SPB379J1 J1 Japan Cow leather Three-fold clasp with push button release

More Seiko SPB references