Seiko Cal. 6631 - 841

The Seiko 6631-841 represents an important milestone in Seiko's 1977 lineup. The Rotating bezel and 46mm case give it a distinctive presence on the wrist. [seikata-wm-2c601fe5e170]

Also known as: UFO, Crown

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

46mm

Case Thickness

15.5mm

Lug Width

18mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

90m

Dial Color

Navy

Jewels

18j

Frequency

36,000 bph

Power Reserve

55 hours

Year

1977

Related Models

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• Seiko 4549-709
• Seiko 4587-477
• Seiko 6322-463
• Seiko 5257-104
• Seiko 4518-920
• Seiko 4496-109
• Seiko 0716-191
• Seiko 0717-830
• Seiko 6632-565
• Seiko 6360-783
• Seiko 4462-957