Seiko Cal. 6686 - 831

The Seiko 6686-831 represents an important milestone in Seiko's 1971 lineup. The Inner Rotating bezel and 35mm case give it a distinctive presence on the wrist. [seikata-wm-20bc51879258]

Also known as: Helmet

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

35mm

Case Thickness

10.1mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

90m

Dial Color

Cream

Jewels

29j

Frequency

21,600 bph

Power Reserve

63 hours

Year

1971

Related Models

• Seiko 5670-153
• Seiko 4567-727
• Seiko 7173-923
• Seiko 7062-680
• Seiko 6333-537
• Seiko 7193-341
• Seiko 6168-252
• Seiko 4574-240
• Seiko 6295-260
• Seiko 5221-495
• Seiko 6359-543
• Seiko 6334-927