Seiko Cal. 7131 - 691

The Seiko 7131-691 represents an important milestone in Seiko's 1974 lineup. With its 21mm lug width and 14.2mm profile, it sits comfortably on most wrists. [seikata-wm-e9fe87aefd9b]

Also known as: Monster, Baby Tuna

Specifications

Movement

Kinetic

Case Material

Titanium

Case Width

40mm

Case Thickness

14.2mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

90m

Dial Color

Navy

Jewels

32j

Frequency

21,600 bph

Power Reserve

60 hours

Year

1974

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