Seiko Cal. 6647 - 639

The Seiko 6647-639 represents an important milestone in Seiko's 1969 lineup. It features a Burgundy dial protected by a Sapphire crystal and offers 100m of water resistance. [seikata-wm-f8dc364907d5]

Also known as: Monster, World Timer

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

39mm

Case Thickness

11.2mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

100m

Dial Color

Burgundy

Jewels

27j

Frequency

36,000 bph

Power Reserve

47 hours

Year

1969

Related Models

• Seiko 4454-878
• Seiko 6685-298
• Seiko 5272-138
• Seiko 7045-428
• Seiko 5664-836
• Seiko 5663-888
• Seiko 7136-640
• Seiko 4522-661
• Seiko 7053-765
• Seiko 3820-469
• Seiko 6172-264
• Seiko 6686-948