Seiko Cal. 5617 - 731

The Seiko 5617-731 represents an important milestone in Seiko's 1973 lineup. With its 21mm lug width and 9.0mm profile, it sits comfortably on most wrists. [seikata-wm-a36161e85229]

Also known as: Bullhead

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

41mm

Case Thickness

9.0mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

160m

Dial Color

Silver

Jewels

22j

Frequency

21,600 bph

Power Reserve

43 hours

Year

1973

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