Seiko Cal. 6639 - 836

The Seiko 6639-836 represents an important milestone in Seiko's 1981 lineup. It features a Black dial protected by a Mineral crystal and offers 200m of water resistance. [seikata-wm-b3cfb4546ed9]

Also known as: Turtle, Bullhead

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

43mm

Case Thickness

9.3mm

Lug Width

21mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

200m

Dial Color

Black

Jewels

19j

Frequency

21,600 bph

Power Reserve

36 hours

Year

1981

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