Seiko Cal. 5631 - 604

The Seiko 5631-604 represents an important milestone in Seiko's 1975 lineup. It features a Silver dial protected by a Sapphire crystal and offers 30m of water resistance. [seikata-wm-bb7200aa1958]

Also known as: UFO, Silverwave

Specifications

Movement

Kinetic

Case Material

PVD Black

Case Width

43mm

Case Thickness

8.1mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

30m

Dial Color

Silver

Jewels

30j

Frequency

36,000 bph

Power Reserve

49 hours

Year

1975

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