Seiko Cal. 6640 - 131

The Seiko 6640-131 represents an important milestone in Seiko's 1991 lineup. The Inner Rotating bezel and 45mm case give it a distinctive presence on the wrist. [seikata-wm-c131470ab804]

Also known as: Navigator

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

45mm

Case Thickness

11.6mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

120m

Dial Color

White

Jewels

24j

Frequency

21,600 bph

Power Reserve

51 hours

Year

1991

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