Seiko Cal. 6637 - 923

The Seiko 6637-923 represents an important milestone in Seiko's 1971 lineup. It features a Navy dial protected by a Acrylic crystal and offers 80m of water resistance. [seikata-wm-724b52b3f82e]

Specifications

Movement

Kinetic

Case Material

PVD Black

Case Width

37mm

Case Thickness

9.7mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

80m

Dial Color

Navy

Jewels

26j

Frequency

21,600 bph

Power Reserve

36 hours

Year

1971

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