Seiko Cal. 6635 - 412

This Hand-Winding model from 1971 features a 40mm Gold-Plated case. With its 20mm lug width and 14.5mm profile, it sits comfortably on most wrists. [seikata-wm-211e660eafe2]

Also known as: Sumo

Specifications

Movement

Hand-Winding

Case Material

Gold-Plated

Case Width

40mm

Case Thickness

14.5mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

130m

Dial Color

Blue Sunburst

Jewels

35j

Frequency

28,800 bph

Power Reserve

69 hours

Year

1971

Related Models

• Seiko 3845-603
• Seiko 4580-326
• Seiko 6225-293
• Seiko 5674-479
• Seiko 5237-265
• Seiko 5683-703
• Seiko 4446-606
• Seiko 7018-637
• Seiko 6218-165
• Seiko 5257-190
• Seiko 4499-697
• Seiko 6320-669