Seiko Cal. 6631 - 642

This Spring Drive model from 1984 features a 45mm Stainless Steel case. With its 18mm lug width and 8.2mm profile, it sits comfortably on most wrists. [seikata-wm-c6e1b0d18808]

Also known as: Turtle

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

45mm

Case Thickness

8.2mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

190m

Dial Color

Champagne

Jewels

31j

Frequency

36,000 bph

Power Reserve

37 hours

Year

1984

Related Models

• Seiko 5257-733
• Seiko 4450-487
• Seiko 5246-430
• Seiko 6235-258
• Seiko 7064-563
• Seiko 0727-439
• Seiko 4425-302
• Seiko 7069-595
• Seiko 3892-320
• Seiko 6256-487
• Seiko 4539-132
• Seiko 4562-828