Seiko Cal. 5631 - 681

This Automatic model from 1969 features a 44mm PVD Black case. It features a Black dial protected by a Mineral crystal and offers 180m of water resistance. [seikata-wm-942c22af8f6b]

Also known as: Silverwave

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

44mm

Case Thickness

13.3mm

Lug Width

20mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

180m

Dial Color

Black

Jewels

28j

Frequency

21,600 bph

Power Reserve

49 hours

Year

1969

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