Seiko Cal. 5640 - 109

Seiko 5640-109

Released in 1966, the Cal. 5640 with design code 109 was part of Seiko's domestic market collection. The Rotating bezel and 34mm case give it a distinctive presence on the wrist. [seikata-wm-a71fc47cf6ba]

Specifications

Movement
Hand-Winding
Case Material
Two-Tone
Case Width
34mm
Case Thickness
9.4mm
Lug Width
20mm
Crystal
Mineral
Bezel
Rotating
Water Resistance
40m
Dial Color
Blue Sunburst
Jewels
35j
Frequency
36,000 bph
Power Reserve
40 hours
Year
1966

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