Seiko Cal. 6635 - 971

The Seiko 6635-971 represents an important milestone in Seiko's 1988 lineup. It features a Black dial protected by a Mineral crystal and offers 180m of water resistance. [seikata-wm-ce67a0bf7e0c]

Also known as: Tuna

Specifications

Movement

Kinetic

Case Material

Titanium

Case Width

45mm

Case Thickness

12.7mm

Lug Width

18mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

180m

Dial Color

Black

Jewels

27j

Frequency

28,800 bph

Power Reserve

55 hours

Year

1988

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