Seiko Cal. 5638 - 956

The Seiko 5638-956 represents an important milestone in Seiko's 1971 lineup. Powered by the 5638 caliber with 25j jewels beating at 21,600 bph, it delivers a 42 hours power reserve. [seikata-wm-3289cc36d367]

Also known as: Golden Tuna

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

45mm

Case Thickness

15.2mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

50m

Dial Color

White

Jewels

25j

Frequency

21,600 bph

Power Reserve

42 hours

Year

1971

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