Seiko Cal. 5640 - 301

The Seiko 5640-301 represents an important milestone in Seiko's 1977 lineup. The Inner Rotating bezel and 43mm case give it a distinctive presence on the wrist. [seikata-wm-a3ec757e8069]

Specifications

Movement

Quartz

Case Material

Hardlex-Coated Steel

Case Width

43mm

Case Thickness

9.3mm

Lug Width

18mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

80m

Dial Color

Champagne

Jewels

28j

Frequency

21,600 bph

Power Reserve

40 hours

Year

1977

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