Seiko Cal. 5646 - 639

The Seiko 5646-639 represents an important milestone in Seiko's 1971 lineup. It features a Burgundy dial protected by a Hardlex crystal and offers 30m of water resistance. [seikata-wm-8cf38ae87005]

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

37mm

Case Thickness

8.3mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

30m

Dial Color

Burgundy

Jewels

20j

Frequency

21,600 bph

Power Reserve

66 hours

Year

1971

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