Seiko Cal. 6640 - 698

The Seiko 6640-698 represents an important milestone in Seiko's 1986 lineup. It features a Silver dial protected by a Acrylic crystal and offers 100m of water resistance. [seikata-wm-07ee3172f597]

Also known as: Tuna

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

41mm

Case Thickness

14.2mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

100m

Dial Color

Silver

Jewels

36j

Frequency

36,000 bph

Power Reserve

40 hours

Year

1986

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