Seiko Cal. 3817 - 731

The Seiko 3817-731 represents an important milestone in Seiko's 1966 lineup. With its 19mm lug width and 9.2mm profile, it sits comfortably on most wrists. [seikata-wm-b49d43842633]

Also known as: Sportsmatic, Bellmatic

Specifications

Movement

Automatic

Case Material

Titanium

Case Width

46mm

Case Thickness

9.2mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

80m

Dial Color

Champagne

Jewels

26j

Frequency

36,000 bph

Power Reserve

36 hours

Year

1966

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