Seiko Cal. 6636 - 510

The Seiko 6636-510 represents an important milestone in Seiko's 1967 lineup. It features a Black dial protected by a Hardlex crystal and offers 40m of water resistance. [seikata-wm-d629bd3fe3bc]

Also known as: Sumo, Bullhead

Specifications

Movement

Quartz

Case Material

Hardlex-Coated Steel

Case Width

41mm

Case Thickness

14.3mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

40m

Dial Color

Black

Jewels

17j

Frequency

21,600 bph

Power Reserve

49 hours

Year

1967

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