Seiko Cal. 6690 - 931

Released in 1981, the Cal. 6690 with design code 931 was part of Seiko's domestic market collection. The Bidirectional bezel and 42mm case give it a distinctive presence on the wrist. [seikata-wm-e218ef65bf18]

Also known as: Bullhead, Sea Horse

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

42mm

Case Thickness

11.3mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

140m

Dial Color

White

Jewels

31j

Frequency

36,000 bph

Power Reserve

66 hours

Year

1981

Related Models

• Seiko 3876-458
• Seiko 5630-589
• Seiko 6136-242
• Seiko 5679-290
• Seiko 4463-110
• Seiko 5629-281
• Seiko 6398-752
• Seiko 5214-101
• Seiko 4471-129
• Seiko 5697-766
• Seiko 7083-876
• Seiko 4461-320