Seiko Cal. 6637 - 274

This Spring Drive model from 1988 features a 38mm Gold-Plated case. With its 21mm lug width and 8.9mm profile, it sits comfortably on most wrists. [seikata-wm-449c16515a37]

Also known as: Sumo, Rally

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

38mm

Case Thickness

8.9mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

90m

Dial Color

Navy

Jewels

20j

Frequency

21,600 bph

Power Reserve

58 hours

Year

1988

Related Models

• Seiko 0731-308
• Seiko 6399-864
• Seiko 0738-908
• Seiko 6330-931
• Seiko 5632-109
• Seiko 0774-705
• Seiko 6638-742
• Seiko 7148-258
• Seiko 5246-465
• Seiko 6225-958
• Seiko 3819-216
• Seiko 5626-246