Seiko Cal. 5638 - 691

The Seiko 5638-691 represents an important milestone in Seiko's 1969 lineup. It features a Green dial protected by a Acrylic crystal and offers 150m of water resistance. [seikata-wm-50ba9b6d6ada]

Also known as: Rally, Bellmatic

Specifications

Movement

Automatic

Case Material

Titanium

Case Width

35mm

Case Thickness

13.2mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

150m

Dial Color

Green

Jewels

35j

Frequency

36,000 bph

Power Reserve

69 hours

Year

1969

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