Seiko Cal. 6636 - 423

The Seiko 6636-423 represents an important milestone in Seiko's 1965 lineup. It features a Black dial protected by a Hardlex crystal and offers 70m of water resistance. [seikata-wm-6096a3177527]

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

40mm

Case Thickness

13.5mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

70m

Dial Color

Black

Jewels

19j

Frequency

36,000 bph

Power Reserve

58 hours

Year

1965

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