Seiko Cal. 5638 - 667

The Seiko 5638-667 represents an important milestone in Seiko's 1973 lineup. Powered by the 5638 caliber with 22j jewels beating at 28,800 bph, it delivers a 39 hours power reserve. [seikata-wm-65542a6ee116]

Also known as: Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

34mm

Case Thickness

9.4mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

170m

Dial Color

Cream

Jewels

22j

Frequency

28,800 bph

Power Reserve

39 hours

Year

1973

Related Models

• Seiko 0711-738
• Seiko 6390-207
• Seiko 6127-825
• Seiko 6171-963
• Seiko 7110-851
• Seiko 7048-151
• Seiko 6322-517
• Seiko 6178-552
• Seiko 4485-258
• Seiko 4534-424
• Seiko 6136-627
• Seiko 6275-423