Seiko Cal. 6636 - 764

This Spring Drive model from 1989 features a 43mm Hardlex-Coated Steel case. The Rotating bezel and 43mm case give it a distinctive presence on the wrist. [seikata-wm-468bd4ec0ac5]

Also known as: World Timer, Navigator

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

43mm

Case Thickness

15.9mm

Lug Width

21mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

40m

Dial Color

Champagne

Jewels

33j

Frequency

36,000 bph

Power Reserve

51 hours

Year

1989

Related Models

• Seiko 6185-966
• Seiko 5245-575
• Seiko 6379-313
• Seiko 7144-342
• Seiko 6151-764
• Seiko 7143-387
• Seiko 5296-181
• Seiko 7138-625
• Seiko 7133-421
• Seiko 4532-169
• Seiko 7052-807
• Seiko 0768-456