Seiko Cal. 6638 - 656

The Seiko 6638-656 represents an important milestone in Seiko's 1976 lineup. It features a Champagne dial protected by a Sapphire crystal and offers 200m of water resistance. [seikata-wm-a06bc20b6ce8]

Also known as: Sumo

Specifications

Movement

Kinetic

Case Material

Hardlex-Coated Steel

Case Width

41mm

Case Thickness

8.0mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

200m

Dial Color

Champagne

Jewels

17j

Frequency

28,800 bph

Power Reserve

45 hours

Year

1976

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