Seiko Cal. 6391 - 680

This Spring Drive model from 1967 features a 38mm Two-Tone case. It features a Navy dial protected by a Mineral crystal and offers 140m of water resistance. [seikata-wm-5f5bd289c4f2]

Also known as: Monster, Sea Horse

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

38mm

Case Thickness

9.4mm

Lug Width

22mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

140m

Dial Color

Navy

Jewels

33j

Frequency

36,000 bph

Power Reserve

38 hours

Year

1967

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