Seiko Cal. 6640 - 175

The Seiko 6640-175 represents an important milestone in Seiko's 1966 lineup. With its 20mm lug width and 11.1mm profile, it sits comfortably on most wrists. [seikata-wm-e696e76487e7]

Also known as: Rally

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

40mm

Case Thickness

11.1mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

100m

Dial Color

Green

Jewels

18j

Frequency

36,000 bph

Power Reserve

57 hours

Year

1966

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