Seiko Cal. 5640 - 617

The Seiko 5640-617 represents an important milestone in Seiko's 1969 lineup. The Coin-Edge bezel and 45mm case give it a distinctive presence on the wrist. [seikata-wm-e924fc25083f]

Also known as: Tuna, Bellmatic

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

45mm

Case Thickness

15.3mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

100m

Dial Color

Green

Jewels

25j

Frequency

21,600 bph

Power Reserve

39 hours

Year

1969

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