Seiko Cal. 6639 - 920

The Seiko 6639-920 represents an important milestone in Seiko's 1976 lineup. It features a Cream dial protected by a Acrylic crystal and offers 60m of water resistance. [seikata-wm-3f59e8b4b172]

Also known as: UFO, Flighty

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

44mm

Case Thickness

15.9mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

60m

Dial Color

Cream

Jewels

31j

Frequency

28,800 bph

Power Reserve

39 hours

Year

1976

Related Models

• Seiko 6228-855
• Seiko 6670-643
• Seiko 6116-288
• Seiko 6271-743
• Seiko 5290-149
• Seiko 6141-680
• Seiko 6381-700
• Seiko 5259-814
• Seiko 6375-442
• Seiko 4472-601
• Seiko 6352-970
• Seiko 4561-664