Seiko Cal. 6637 - 647

The Seiko 6637-647 represents an important milestone in Seiko's 1991 lineup. It features a Champagne dial protected by a Hardlex crystal and offers 130m of water resistance. [seikata-wm-84f4f4c04d4f]

Specifications

Movement

Automatic

Case Material

Gold-Plated

Case Width

36mm

Case Thickness

15.5mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

130m

Dial Color

Champagne

Jewels

36j

Frequency

36,000 bph

Power Reserve

37 hours

Year

1991

Related Models

• Seiko 7136-732
• Seiko 6238-317
• Seiko 3860-450
• Seiko 6239-819
• Seiko 4493-348
• Seiko 5293-750
• Seiko 5622-648
• Seiko 6680-655
• Seiko 4438-306
• Seiko 7185-286
• Seiko 6298-103
• Seiko 6297-277