Seiko Cal. 6636 - 916

Seiko 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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