Seiko Cal. 6613 - 640

The Seiko 6613-640 represents an important milestone in Seiko's 1988 lineup. The Inner Rotating bezel and 39mm case give it a distinctive presence on the wrist. [seikata-wm-1baaf3fce485]

Specifications

Movement

Quartz

Case Material

Hardlex-Coated Steel

Case Width

39mm

Case Thickness

10.1mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

30m

Dial Color

Green

Jewels

20j

Frequency

28,800 bph

Power Reserve

37 hours

Year

1988

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