Seiko Cal. 6635 - 923

This Spring Drive model from 1966 features a 37mm PVD Black case. With its 21mm lug width and 10.2mm profile, it sits comfortably on most wrists. [seikata-wm-0a590a9a28e4]

Also known as: Sea Horse

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

37mm

Case Thickness

10.2mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

50m

Dial Color

Navy

Jewels

21j

Frequency

36,000 bph

Power Reserve

61 hours

Year

1966

Related Models

• Seiko 7019-287
• Seiko 3885-328
• Seiko 6671-446
• Seiko 0799-920
• Seiko 7029-986
• Seiko 4518-937
• Seiko 4527-635
• Seiko 4599-391
• Seiko 7155-844
• Seiko 0757-749
• Seiko 7163-920
• Seiko 5235-492