Seiko Cal. 6643 - 171

The Seiko 6643-171 represents an important milestone in Seiko's 1977 lineup. It features a Black dial protected by a Hardlex crystal and offers 110m of water resistance. [seikata-wm-2842c2d7a281]

Also known as: Turtle, Helmet

Specifications

Movement

Kinetic

Case Material

Gold-Plated

Case Width

42mm

Case Thickness

8.6mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

110m

Dial Color

Black

Jewels

18j

Frequency

36,000 bph

Power Reserve

47 hours

Year

1977

Related Models

• Seiko 3812-389
• Seiko 7168-701
• Seiko 5269-477
• Seiko 7071-211
• Seiko 5684-102
• Seiko 5253-626
• Seiko 3819-614
• Seiko 0725-402
• Seiko 4460-852
• Seiko 7043-460
• Seiko 7194-689
• Seiko 4589-880