Seiko Cal. 6638 - 358

The Seiko 6638-358 represents an important milestone in Seiko's 1988 lineup. The Inner Rotating bezel and 44mm case give it a distinctive presence on the wrist. [seikata-wm-cbb17edb3a13]

Also known as: Emperor

Specifications

Movement

Quartz

Case Material

Two-Tone

Case Width

44mm

Case Thickness

15.8mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

110m

Dial Color

White

Jewels

23j

Frequency

36,000 bph

Power Reserve

37 hours

Year

1988

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