Seiko Cal. 6635 - 749

This Spring Drive model from 1991 features a 34mm PVD Black case. With its 22mm lug width and 11.6mm profile, it sits comfortably on most wrists. [seikata-wm-553e6bc83172]

Also known as: Helmet, Navigator

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

34mm

Case Thickness

11.6mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

160m

Dial Color

Navy

Jewels

31j

Frequency

36,000 bph

Power Reserve

51 hours

Year

1991

Related Models

• Seiko 5234-978
• Seiko 6220-863
• Seiko 7015-523
• Seiko 3865-653
• Seiko 6126-726
• Seiko 6691-301
• Seiko 6158-976
• Seiko 5263-250
• Seiko 7054-427
• Seiko 6196-382
• Seiko 7067-679
• Seiko 6139-507