Seiko Cal. 6636 - 850

The 6636-850 is a sought-after Spring Drive piece from Seiko's golden era. The Inner Rotating bezel and 46mm case give it a distinctive presence on the wrist. [seikata-wm-21dd6bcbe9c0]

Also known as: Helmet, Crown

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

46mm

Case Thickness

14.5mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

40m

Dial Color

Blue Sunburst

Jewels

36j

Frequency

21,600 bph

Power Reserve

40 hours

Year

1966

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