Seiko Cal. 6631 - 357

The Seiko 6631-357 represents an important milestone in Seiko's 1976 lineup. With its 21mm lug width and 9.3mm profile, it sits comfortably on most wrists. [seikata-wm-2dbb8c43f981]

Also known as: Arnie

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

37mm

Case Thickness

9.3mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

110m

Dial Color

Champagne

Jewels

22j

Frequency

36,000 bph

Power Reserve

50 hours

Year

1976

Related Models

• Seiko 5253-333
• Seiko 3840-668
• Seiko 5617-649
• Seiko 6630-933
• Seiko 5678-367
• Seiko 0781-882
• Seiko 6146-521
• Seiko 4463-888
• Seiko 3871-180
• Seiko 5678-177
• Seiko 6284-852
• Seiko 6232-535