Seiko Cal. 6640 - 586

The Seiko 6640-586 represents an important milestone in Seiko's 1977 lineup. With its 18mm lug width and 11.3mm profile, it sits comfortably on most wrists. [seikata-wm-c0813942c9ff]

Also known as: Baby Tuna, Arnie

Specifications

Movement

Solar

Case Material

Two-Tone

Case Width

35mm

Case Thickness

11.3mm

Lug Width

18mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

40m

Dial Color

White

Jewels

33j

Frequency

28,800 bph

Power Reserve

55 hours

Year

1977

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