Seiko Cal. 5690 - 666

This Automatic model from 1968 features a 37mm Hardlex-Coated Steel case. It features a Navy dial protected by a Hardlex crystal and offers 40m of water resistance. [seikata-wm-d5f492cd2aaf]

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

37mm

Case Thickness

14.0mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

40m

Dial Color

Navy

Jewels

31j

Frequency

28,800 bph

Power Reserve

50 hours

Year

1968

Related Models

• Seiko 5296-746
• Seiko 5263-156
• Seiko 7142-492
• Seiko 5653-392
• Seiko 4440-654
• Seiko 3892-874
• Seiko 6228-575
• Seiko 7013-394
• Seiko 6167-843
• Seiko 6157-969
• Seiko 4467-766
• Seiko 3834-866