Seiko Cal. 5631 - 396

This Hand-Winding model from 1976 features a 38mm PVD Black case. It features a Black dial protected by a Mineral crystal and offers 80m of water resistance. [seikata-wm-3945fd013d0e]

Also known as: Tuna

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

38mm

Case Thickness

8.3mm

Lug Width

22mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

80m

Dial Color

Black

Jewels

36j

Frequency

28,800 bph

Power Reserve

65 hours

Year

1976

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