Seiko Cal. 6640 - 611

The 6640-611 is a sought-after Spring Drive piece from Seiko's golden era. With its 22mm lug width and 10.2mm profile, it sits comfortably on most wrists. [seikata-wm-e657bbe96ef0]

Also known as: Sumo, Golden Tuna

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

41mm

Case Thickness

10.2mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

170m

Dial Color

White

Jewels

20j

Frequency

28,800 bph

Power Reserve

52 hours

Year

1974

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