Seiko Cal. 6639 - 855

This Spring Drive model from 1997 features a 37mm Titanium case. It features a Navy dial protected by a Acrylic crystal and offers 30m of water resistance. [seikata-wm-33d49da113f0]

Also known as: Sumo, Bullhead

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

37mm

Case Thickness

12.1mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

30m

Dial Color

Navy

Jewels

19j

Frequency

21,600 bph

Power Reserve

48 hours

Year

1997

Related Models

• Seiko 5692-796
• Seiko 6398-104
• Seiko 6619-488
• Seiko 6697-775
• Seiko 5631-563
• Seiko 6195-231
• Seiko 4574-719
• Seiko 3879-757
• Seiko 3818-234
• Seiko 5290-761
• Seiko 3867-435
• Seiko 0772-290