Seiko Cal. 5691 - 838

This Quartz model from 1970 features a 41mm Titanium case. The Bidirectional bezel and 41mm case give it a distinctive presence on the wrist. [seikata-wm-e762e835615a]

Also known as: Tuna, Bellmatic

Specifications

Movement

Quartz

Case Material

Titanium

Case Width

41mm

Case Thickness

15.3mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

130m

Dial Color

Navy

Jewels

36j

Frequency

28,800 bph

Power Reserve

46 hours

Year

1970

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