Seiko Cal. 6331 - 561

The Seiko 6331-561 represents an important milestone in Seiko's 1984 lineup. With its 19mm lug width and 15.9mm profile, it sits comfortably on most wrists. [seikata-wm-acbfbb30aa78]

Also known as: Sumo, Bellmatic

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

44mm

Case Thickness

15.9mm

Lug Width

19mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

200m

Dial Color

Blue Sunburst

Jewels

32j

Frequency

21,600 bph

Power Reserve

61 hours

Year

1984

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