Seiko Cal. 6638 - 679

The Seiko 6638-679 represents an important milestone in Seiko's 1988 lineup. The Rotating bezel and 41mm case give it a distinctive presence on the wrist. [seikata-wm-2ef81b81e591]

Also known as: Sumo

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

41mm

Case Thickness

11.6mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

190m

Dial Color

White

Jewels

17j

Frequency

21,600 bph

Power Reserve

46 hours

Year

1988

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