Seiko Cal. 6643 - 390

The Seiko 6643-390 represents an important milestone in Seiko's 1972 lineup. It features a Green dial protected by a Hardlex crystal and offers 70m of water resistance. [seikata-wm-a033fe519b18]

Specifications

Movement

Hand-Winding

Case Material

Gold-Plated

Case Width

41mm

Case Thickness

14.6mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

70m

Dial Color

Green

Jewels

22j

Frequency

21,600 bph

Power Reserve

39 hours

Year

1972

Related Models

• Seiko 6287-792
• Seiko 6250-326
• Seiko 5297-738
• Seiko 5264-579
• Seiko 0788-457
• Seiko 6188-380
• Seiko 6176-104
• Seiko 6141-491
• Seiko 7138-918
• Seiko 7012-793
• Seiko 5680-252
• Seiko 5222-682