Seiko Cal. 5691 - 639

The Seiko 5691-639 represents an important milestone in Seiko's 1990 lineup. Powered by the 5691 caliber with 18j jewels beating at 36,000 bph, it delivers a 56 hours power reserve. [seikata-wm-bf20354eee1e]

Also known as: Silverwave

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

41mm

Case Thickness

9.7mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

140m

Dial Color

White

Jewels

18j

Frequency

36,000 bph

Power Reserve

56 hours

Year

1990

Related Models

• Seiko 6391-525
• Seiko 6186-894
• Seiko 7173-270
• Seiko 7085-518
• Seiko 4512-899
• Seiko 3835-177
• Seiko 4497-443
• Seiko 5630-556
• Seiko 5621-693
• Seiko 5251-843
• Seiko 5231-917
• Seiko 7176-273