Seiko Cal. 5640 - 128

The Seiko 5640-128 represents an important milestone in Seiko's 1978 lineup. The Coin-Edge bezel and 43mm case give it a distinctive presence on the wrist. [seikata-wm-34925b154116]

Also known as: Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

43mm

Case Thickness

8.9mm

Lug Width

18mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

70m

Dial Color

Navy

Jewels

17j

Frequency

21,600 bph

Power Reserve

40 hours

Year

1978

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