Seiko Cal. 5639 - 906

The Seiko 5639-906 represents an important milestone in Seiko's 1974 lineup. Powered by the 5639 caliber with 25j jewels beating at 28,800 bph, it delivers a 64 hours power reserve. [seikata-wm-755b2fe48dbc]

Also known as: Helmet, World Timer

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

36mm

Case Thickness

12.7mm

Lug Width

19mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

160m

Dial Color

Cream

Jewels

25j

Frequency

28,800 bph

Power Reserve

64 hours

Year

1974

Related Models

• Seiko 4438-567
• Seiko 5299-923
• Seiko 7051-420
• Seiko 7151-529
• Seiko 6186-704
• Seiko 4429-719
• Seiko 7038-186
• Seiko 7068-799
• Seiko 7073-628
• Seiko 5234-745
• Seiko 4432-770
• Seiko 4443-711