Seiko Cal. 3831 - 939

The Seiko 3831-939 represents an important milestone in Seiko's 1999 lineup. The Rotating bezel and 35mm case give it a distinctive presence on the wrist. [seikata-wm-51b5ffa17fd6]

Also known as: Monster

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

35mm

Case Thickness

11.9mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

50m

Dial Color

Blue Sunburst

Jewels

21j

Frequency

21,600 bph

Power Reserve

71 hours

Year

1999

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