Seiko Cal. 5640 - 371

The Seiko 5640-371 represents an important milestone in Seiko's 1968 lineup. It features a Black dial protected by a Hardlex crystal and offers 130m of water resistance. [seikata-wm-4dd7314bc178]

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

43mm

Case Thickness

12.3mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

130m

Dial Color

Black

Jewels

25j

Frequency

28,800 bph

Power Reserve

71 hours

Year

1968

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