Seiko Cal. 6689 - 740

The Seiko 6689-740 represents an important milestone in Seiko's 1976 lineup. It features a Black dial protected by a Mineral crystal and offers 50m of water resistance. [seikata-wm-89da36379594]

Also known as: Monster

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

36mm

Case Thickness

14.4mm

Lug Width

18mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

50m

Dial Color

Black

Jewels

29j

Frequency

21,600 bph

Power Reserve

38 hours

Year

1976

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