Seiko Cal. 6634 - 331

The Seiko 6634-331 represents an important milestone in Seiko's 1997 lineup. Powered by the 6634 caliber with 32j jewels beating at 21,600 bph, it delivers a 66 hours power reserve. [seikata-wm-851437ad2fb1]

Also known as: Tuna

Specifications

Movement

Automatic

Case Material

Stainless Steel

Case Width

42mm

Case Thickness

15.9mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

70m

Dial Color

Cream

Jewels

32j

Frequency

21,600 bph

Power Reserve

66 hours

Year

1997

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