Seiko Cal. 5665 - 636

The Seiko 5665-636 represents an important milestone in Seiko's 1978 lineup. Powered by the 5665 caliber with 17j jewels beating at 36,000 bph, it delivers a 61 hours power reserve. [seikata-wm-25e565f6bd61]

Also known as: Turtle, Navigator

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

35mm

Case Thickness

14.0mm

Lug Width

21mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

90m

Dial Color

Black

Jewels

17j

Frequency

36,000 bph

Power Reserve

61 hours

Year

1978

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