Seiko Cal. 6635 - 766

The Seiko 6635-766 represents an important milestone in Seiko's 1979 lineup. It features a Black dial protected by a Sapphire crystal and offers 80m of water resistance. [seikata-wm-6444119ef584]

Also known as: Monster

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

36mm

Case Thickness

11.7mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

80m

Dial Color

Black

Jewels

20j

Frequency

28,800 bph

Power Reserve

57 hours

Year

1979

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