Seiko Cal. 5631 - 935

The Seiko 5631-935 represents an important milestone in Seiko's 1997 lineup. Powered by the 5631 caliber with 24j jewels beating at 21,600 bph, it delivers a 60 hours power reserve. [seikata-wm-41b127d99ceb]

Also known as: Helmet, Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

37mm

Case Thickness

14.3mm

Lug Width

20mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

70m

Dial Color

Black

Jewels

24j

Frequency

21,600 bph

Power Reserve

60 hours

Year

1997

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