Seiko Cal. 6641 - 429

This Spring Drive model from 1973 features a 39mm Titanium case. The Bidirectional bezel and 39mm case give it a distinctive presence on the wrist. [seikata-wm-df57493b93f5]

Also known as: Sumo, Goldfeather

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

39mm

Case Thickness

8.2mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

140m

Dial Color

Blue Sunburst

Jewels

33j

Frequency

36,000 bph

Power Reserve

50 hours

Year

1973

Related Models

• Seiko 6373-335
• Seiko 6338-345
• Seiko 6667-456
• Seiko 4595-938
• Seiko 6335-607
• Seiko 6197-698
• Seiko 4576-262
• Seiko 3829-396
• Seiko 4532-178
• Seiko 3882-928
• Seiko 7176-927
• Seiko 4453-777