Seiko Cal. 3813 - 331

The Seiko 3813-331 represents an important milestone in Seiko's 1999 lineup. The Fixed bezel and 37mm case give it a distinctive presence on the wrist. [seikata-wm-fff1a6b23e30]

Also known as: Bullhead, UFO

Specifications

Movement

Kinetic

Case Material

Gold-Plated

Case Width

37mm

Case Thickness

9.4mm

Lug Width

22mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

110m

Dial Color

Blue Sunburst

Jewels

23j

Frequency

28,800 bph

Power Reserve

53 hours

Year

1999

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