Seiko Cal. 6637 - 663

This Spring Drive model from 1997 features a 36mm Stainless Steel case. It features a Blue Sunburst dial protected by a Hardlex crystal and offers 110m of water resistance. [seikata-wm-a2e8f54c9558]

Also known as: Sportsmatic

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

36mm

Case Thickness

15.6mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

110m

Dial Color

Blue Sunburst

Jewels

30j

Frequency

21,600 bph

Power Reserve

43 hours

Year

1997

Related Models

• Seiko 7140-882
• Seiko 3829-401
• Seiko 6266-793
• Seiko 6679-602
• Seiko 4552-583
• Seiko 6124-675
• Seiko 4524-999
• Seiko 0761-722
• Seiko 3875-147
• Seiko 5279-627
• Seiko 6346-288
• Seiko 4456-797