Seiko Cal. 6636 - 694

This Spring Drive model from 1970 features a 37mm PVD Black case. Powered by the 6636 caliber with 31j jewels beating at 21,600 bph, it delivers a 53 hours power reserve. [seikata-wm-c2d0b4b8c387]

Also known as: Monster, Silverwave

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

37mm

Case Thickness

8.4mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

140m

Dial Color

Blue Sunburst

Jewels

31j

Frequency

21,600 bph

Power Reserve

53 hours

Year

1970

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