Seiko Cal. 6636 - 916

The Seiko 6636-916 represents an important milestone in Seiko's 1971 lineup. Powered by the 6636 caliber with 18j jewels beating at 36,000 bph, it delivers a 56 hours power reserve. [seikata-wm-561a63f64062]

Also known as: Bullhead, UFO

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

44mm

Case Thickness

15.0mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

160m

Dial Color

Cream

Jewels

18j

Frequency

36,000 bph

Power Reserve

56 hours

Year

1971

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