Seiko Cal. 3831 - 477

This Spring Drive model from 1970 features a 44mm Two-Tone case. With its 20mm lug width and 9.1mm profile, it sits comfortably on most wrists. [seikata-wm-7500ea5d7d4d]

Also known as: Tuna

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

44mm

Case Thickness

9.1mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

170m

Dial Color

Cream

Jewels

27j

Frequency

28,800 bph

Power Reserve

37 hours

Year

1970

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