Seiko Cal. 6640 - 562

This Spring Drive model from 1979 features a 39mm Hardlex-Coated Steel case. With its 22mm lug width and 15.2mm profile, it sits comfortably on most wrists. [seikata-wm-0e62612e4167]

Also known as: UFO

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

39mm

Case Thickness

15.2mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

60m

Dial Color

Silver

Jewels

34j

Frequency

21,600 bph

Power Reserve

42 hours

Year

1979

Related Models

• Seiko 6220-150
• Seiko 6610-501
• Seiko 6666-156
• Seiko 6351-518
• Seiko 7180-794
• Seiko 5224-450
• Seiko 3824-529
• Seiko 6359-937
• Seiko 0767-358
• Seiko 3837-686
• Seiko 5672-127
• Seiko 7039-705