Seiko Cal. 6643 - 143

The Seiko 6643-143 represents an important milestone in Seiko's 1979 lineup. It features a Black dial protected by a Hardlex crystal and offers 190m of water resistance. [seikata-wm-f04c7bc8b0ee]

Also known as: Sumo

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

36mm

Case Thickness

8.3mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

190m

Dial Color

Black

Jewels

30j

Frequency

36,000 bph

Power Reserve

60 hours

Year

1979

Related Models

• Seiko 0726-225
• Seiko 4550-581
• Seiko 4537-189
• Seiko 7151-688
• Seiko 6696-709
• Seiko 7156-920
• Seiko 3874-651
• Seiko 7087-917
• Seiko 4452-508
• Seiko 6190-221
• Seiko 3873-455
• Seiko 6630-711