Seiko Cal. 6680 - 390

The Seiko 6680-390 represents an important milestone in Seiko's 1978 lineup. It features a Black dial protected by a Hardlex crystal and offers 70m of water resistance. [seikata-wm-88fc80d702df]

Also known as: Monster, Navigator

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

34mm

Case Thickness

12.7mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

70m

Dial Color

Black

Jewels

19j

Frequency

28,800 bph

Power Reserve

66 hours

Year

1978

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