Seiko Cal. 6640 - 120

The Seiko 6640-120 represents an important milestone in Seiko's 1983 lineup. With its 18mm lug width and 14.6mm profile, it sits comfortably on most wrists. [seikata-wm-797ab800f224]

Also known as: Tuna, Golden Tuna

Specifications

Movement

Hand-Winding

Case Material

Gold-Plated

Case Width

43mm

Case Thickness

14.6mm

Lug Width

18mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

60m

Dial Color

White

Jewels

21j

Frequency

36,000 bph

Power Reserve

65 hours

Year

1983

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