Seiko Cal. 5641 - 587

The Seiko 5641-587 represents an important milestone in Seiko's 1977 lineup. Powered by the 5641 caliber with 28j jewels beating at 21,600 bph, it delivers a 59 hours power reserve. [seikata-wm-4c7f1038f489]

Also known as: Turtle, Sumo

Specifications

Movement

Quartz

Case Material

Hardlex-Coated Steel

Case Width

44mm

Case Thickness

14.8mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

50m

Dial Color

Cream

Jewels

28j

Frequency

21,600 bph

Power Reserve

59 hours

Year

1977

Related Models

• Seiko 7141-447
• Seiko 0766-817
• Seiko 7039-927
• Seiko 6352-738
• Seiko 0736-695
• Seiko 4569-609
• Seiko 0778-781
• Seiko 4438-511
• Seiko 0754-630
• Seiko 7128-621
• Seiko 3854-464
• Seiko 5619-633