Seiko Cal. 6636 - 987

The Seiko 6636-987 represents an important milestone in Seiko's 1970 lineup. Powered by the 6636 caliber with 34j jewels beating at 36,000 bph, it delivers a 42 hours power reserve. [seikata-wm-5f662e2f06fe]

Also known as: Tuna

Specifications

Movement

Solar

Case Material

Two-Tone

Case Width

39mm

Case Thickness

15.1mm

Lug Width

19mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

150m

Dial Color

Burgundy

Jewels

34j

Frequency

36,000 bph

Power Reserve

42 hours

Year

1970

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