Seiko Cal. 6636 - 391

The Seiko 6636-391 represents an important milestone in Seiko's 1987 lineup. The Inner Rotating bezel and 38mm case give it a distinctive presence on the wrist. [seikata-wm-59889192a0ec]

Also known as: Flighty

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

38mm

Case Thickness

11.3mm

Lug Width

20mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

180m

Dial Color

Black

Jewels

32j

Frequency

21,600 bph

Power Reserve

55 hours

Year

1987

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