Seiko Cal. 5640 - 635

Seiko 5640-635

This Automatic model from 1978 features a 46mm Titanium case. It features a Blue Sunburst dial protected by a Mineral crystal and offers 90m of water resistance. [seikata-wm-e79df643c6c2]

Specifications

Movement
Automatic
Case Material
Titanium
Case Width
46mm
Case Thickness
8.1mm
Lug Width
20mm
Crystal
Mineral
Bezel
Fixed
Water Resistance
90m
Dial Color
Blue Sunburst
Jewels
28j
Frequency
21,600 bph
Power Reserve
71 hours
Year
1978

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