Seiko Cal. 5613 - 731

The Seiko 5613-731 represents an important milestone in Seiko's 1971 lineup. With its 21mm lug width and 11.1mm profile, it sits comfortably on most wrists. [seikata-wm-32eab9554fc7]

Also known as: Bullhead

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

46mm

Case Thickness

11.1mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

170m

Dial Color

Black

Jewels

34j

Frequency

28,800 bph

Power Reserve

53 hours

Year

1971

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