Seiko Cal. 5640 - 976

The 5640-976 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 5640 caliber with 17j jewels beating at 28,800 bph, it delivers a 37 hours power reserve. [seikata-wm-c5eda0297729]

Also known as: Golden Tuna

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

34mm

Case Thickness

13.0mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

40m

Dial Color

Blue Sunburst

Jewels

17j

Frequency

28,800 bph

Power Reserve

37 hours

Year

1988

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