Seiko Cal. 5640 - 687

The Seiko 5640-687 represents an important milestone in Seiko's 1996 lineup. The Bidirectional bezel and 42mm case give it a distinctive presence on the wrist. [seikata-wm-7b9bcc7921a1]

Also known as: Navigator

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

42mm

Case Thickness

10.9mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

190m

Dial Color

Navy

Jewels

32j

Frequency

28,800 bph

Power Reserve

72 hours

Year

1996

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