Seiko Cal. 6331 - 899

The Seiko 6331-899 represents an important milestone in Seiko's 1980 lineup. With its 20mm lug width and 15.1mm profile, it sits comfortably on most wrists. [seikata-wm-001255d7a9b8]

Also known as: Sumo, Bellmatic

Specifications

Movement

Kinetic

Case Material

Two-Tone

Case Width

34mm

Case Thickness

15.1mm

Lug Width

20mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

170m

Dial Color

Cream

Jewels

25j

Frequency

21,600 bph

Power Reserve

56 hours

Year

1980

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