Seiko Cal. 6636 - 742

The Seiko 6636-742 represents an important milestone in Seiko's 1972 lineup. It features a Black dial protected by a Sapphire crystal and offers 100m of water resistance. [seikata-wm-64eee54fdb6b]

Also known as: Goldfeather, Sea Horse

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

44mm

Case Thickness

10.2mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

100m

Dial Color

Black

Jewels

33j

Frequency

21,600 bph

Power Reserve

61 hours

Year

1972

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