Seiko Cal. 6640 - 160

The Seiko 6640-160 represents an important milestone in Seiko's 1984 lineup. With its 21mm lug width and 12.6mm profile, it sits comfortably on most wrists. [seikata-wm-9b40630a21c1]

Also known as: Sumo, Pogue

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

44mm

Case Thickness

12.6mm

Lug Width

21mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

140m

Dial Color

Navy

Jewels

18j

Frequency

36,000 bph

Power Reserve

50 hours

Year

1984

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