Seiko Cal. 6391 - 977

This Spring Drive model from 1986 features a 37mm Titanium case. It features a Navy dial protected by a Acrylic crystal and offers 90m of water resistance. [seikata-wm-0ec250e9f7e5]

Also known as: Sportsmatic

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

37mm

Case Thickness

14.2mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

90m

Dial Color

Navy

Jewels

36j

Frequency

36,000 bph

Power Reserve

64 hours

Year

1986

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