Seiko Cal. 6631 - 612

The Seiko 6631-612 represents an important milestone in Seiko's 1991 lineup. The Coin-Edge bezel and 41mm case give it a distinctive presence on the wrist. [seikata-wm-742ab77e1e46]

Also known as: Bellmatic, World Timer

Specifications

Movement

Automatic

Case Material

Titanium

Case Width

41mm

Case Thickness

13.8mm

Lug Width

19mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

150m

Dial Color

Green

Jewels

18j

Frequency

28,800 bph

Power Reserve

54 hours

Year

1991

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