Seiko Cal. 6634 - 436

The Seiko 6634-436 represents an important milestone in Seiko's 1972 lineup. Powered by the 6634 caliber with 31j jewels beating at 36,000 bph, it delivers a 72 hours power reserve. [seikata-wm-fb3901c6319c]

Also known as: Monster, Bullhead

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

37mm

Case Thickness

12.9mm

Lug Width

19mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

150m

Dial Color

Cream

Jewels

31j

Frequency

36,000 bph

Power Reserve

72 hours

Year

1972

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