Seiko Cal. 5640 - 156

The Seiko 5640-156 represents an important milestone in Seiko's 1974 lineup. Powered by the 5640 caliber with 27j jewels beating at 36,000 bph, it delivers a 39 hours power reserve. [seikata-wm-a3f8842b4aa5]

Also known as: Golden Tuna

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

41mm

Case Thickness

10.7mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

40m

Dial Color

White

Jewels

27j

Frequency

36,000 bph

Power Reserve

39 hours

Year

1974

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