Seiko Cal. 6643 - 491

The Seiko 6643-491 represents an important milestone in Seiko's 1977 lineup. It features a Champagne dial protected by a Hardlex crystal and offers 50m of water resistance. [seikata-wm-94dda4eddb36]

Also known as: Sumo

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

36mm

Case Thickness

8.8mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

50m

Dial Color

Champagne

Jewels

36j

Frequency

28,800 bph

Power Reserve

55 hours

Year

1977

Related Models

• Seiko 4589-408
• Seiko 6194-463
• Seiko 6674-540
• Seiko 6292-603
• Seiko 3829-988
• Seiko 4570-238
• Seiko 6284-740
• Seiko 7199-141
• Seiko 5276-170
• Seiko 3818-253
• Seiko 7111-260
• Seiko 6164-831