Seiko Cal. 6631 - 693

The Seiko 6631-693 represents an important milestone in Seiko's 1979 lineup. With its 18mm lug width and 9.5mm profile, it sits comfortably on most wrists. [seikata-wm-6bd57414fa9a]

Also known as: Sumo, Panda

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

36mm

Case Thickness

9.5mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

180m

Dial Color

Blue Sunburst

Jewels

18j

Frequency

28,800 bph

Power Reserve

72 hours

Year

1979

Related Models

• Seiko 6161-387
• Seiko 7189-202
• Seiko 7196-635
• Seiko 6380-739
• Seiko 4588-933
• Seiko 7040-723
• Seiko 0772-928
• Seiko 0785-169
• Seiko 0771-396
• Seiko 6312-348
• Seiko 4420-235
• Seiko 4578-251