Seiko Cal. 6639 - 325

The Seiko 6639-325 represents an important milestone in Seiko's 1990 lineup. It features a Blue Sunburst dial protected by a Sapphire crystal and offers 50m of water resistance. [seikata-wm-e7f0f8d1b83b]

Also known as: Monster, UFO

Specifications

Movement

Quartz

Case Material

Two-Tone

Case Width

45mm

Case Thickness

15.4mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

50m

Dial Color

Blue Sunburst

Jewels

22j

Frequency

36,000 bph

Power Reserve

60 hours

Year

1990

Related Models

• Seiko 6181-456
• Seiko 5282-839
• Seiko 7072-990
• Seiko 5666-257
• Seiko 4481-495
• Seiko 6196-852
• Seiko 5291-660
• Seiko 6665-777
• Seiko 7156-410
• Seiko 7090-270
• Seiko 6647-298
• Seiko 7023-374