Seiko Cal. 5647 - 416

This Spring Drive model from 1984 features a 36mm Stainless Steel case. With its 21mm lug width and 12.8mm profile, it sits comfortably on most wrists. [seikata-wm-fe7e8871aa5a]

Also known as: Bullhead, Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

36mm

Case Thickness

12.8mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

200m

Dial Color

Blue Sunburst

Jewels

21j

Frequency

36,000 bph

Power Reserve

51 hours

Year

1984

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