Seiko Cal. 6637 - 881

This Spring Drive model from 1975 features a 39mm Stainless Steel case. With its 20mm lug width and 12.1mm profile, it sits comfortably on most wrists. [seikata-wm-1ca45be164f5]

Also known as: Crown

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

39mm

Case Thickness

12.1mm

Lug Width

20mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

140m

Dial Color

Green

Jewels

23j

Frequency

36,000 bph

Power Reserve

57 hours

Year

1975

Related Models

• Seiko 5698-647
• Seiko 5680-442
• Seiko 7117-462
• Seiko 3863-971
• Seiko 7028-683
• Seiko 5224-215
• Seiko 4518-477
• Seiko 6134-463
• Seiko 7176-979
• Seiko 4553-927
• Seiko 4410-207
• Seiko 5220-786