Seiko Cal. 6636 - 191

The Seiko 6636-191 represents an important milestone in Seiko's 1978 lineup. The Bidirectional bezel and 42mm case give it a distinctive presence on the wrist. [seikata-wm-0ca481240aec]

Also known as: Helmet

Specifications

Movement

Kinetic

Case Material

Hardlex-Coated Steel

Case Width

42mm

Case Thickness

10.4mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

30m

Dial Color

Navy

Jewels

30j

Frequency

28,800 bph

Power Reserve

59 hours

Year

1978

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