Seiko Cal. 5684 - 740

This Spring Drive model from 1977 features a 36mm Stainless Steel case. With its 19mm lug width and 9.0mm profile, it sits comfortably on most wrists. [seikata-wm-e5cdc248fae8]

Also known as: Monster, Tuna

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

36mm

Case Thickness

9.0mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

90m

Dial Color

Green

Jewels

22j

Frequency

21,600 bph

Power Reserve

40 hours

Year

1977

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