Seiko Cal. 6637 - 446

The Seiko 6637-446 represents an important milestone in Seiko's 1980 lineup. With its 18mm lug width and 13.1mm profile, it sits comfortably on most wrists. [seikata-wm-089bc0c73526]

Also known as: Navigator, Arnie

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

45mm

Case Thickness

13.1mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

190m

Dial Color

Burgundy

Jewels

30j

Frequency

36,000 bph

Power Reserve

46 hours

Year

1980

Related Models

• Seiko 6149-865
• Seiko 6337-725
• Seiko 3823-381
• Seiko 0782-720
• Seiko 6111-103
• Seiko 4572-798
• Seiko 4592-500
• Seiko 6685-987
• Seiko 7048-216
• Seiko 7158-286
• Seiko 7119-682
• Seiko 6112-775