Seiko Cal. 3831 - 354

This Spring Drive model from 1981 features a 37mm Two-Tone case. With its 18mm lug width and 15.5mm profile, it sits comfortably on most wrists. [seikata-wm-a775db98e052]

Also known as: Helmet, UFO

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

37mm

Case Thickness

15.5mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

40m

Dial Color

Black

Jewels

29j

Frequency

36,000 bph

Power Reserve

49 hours

Year

1981

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