Seiko Cal. 6391 - 687

The Seiko 6391-687 represents an important milestone in Seiko's 1989 lineup. The Bidirectional bezel and 44mm case give it a distinctive presence on the wrist. [seikata-wm-6e4cf7377093]

Also known as: World Timer

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

44mm

Case Thickness

14.0mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

70m

Dial Color

Black

Jewels

27j

Frequency

21,600 bph

Power Reserve

54 hours

Year

1989

Related Models

• Seiko 4524-390
• Seiko 7155-478
• Seiko 6170-399
• Seiko 3884-895
• Seiko 4447-894
• Seiko 5215-547
• Seiko 4469-658
• Seiko 7195-347
• Seiko 6214-544
• Seiko 0739-806
• Seiko 7131-354
• Seiko 4462-216