Seiko Cal. 6640 - 139

Seiko 6640-139

The 6640-139 is a sought-after Kinetic piece from Seiko's golden era. With its 22mm lug width and 12.9mm profile, it sits comfortably on most wrists. [seikata-wm-62a839a4aa5b]

Also known as: Tuna, Rally

Specifications

Movement
Kinetic
Case Material
Stainless Steel
Case Width
35mm
Case Thickness
12.9mm
Lug Width
22mm
Crystal
Sapphire
Bezel
Bidirectional
Water Resistance
40m
Dial Color
Silver
Jewels
20j
Frequency
21,600 bph
Power Reserve
45 hours
Year
1981

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