Seiko Cal. 6640 - 857

The Seiko 6640-857 represents an important milestone in Seiko's 1995 lineup. The Bidirectional bezel and 42mm case give it a distinctive presence on the wrist. [seikata-wm-b74525df1a1e]

Also known as: Panda, Sea Horse

Specifications

Movement

Quartz

Case Material

Hardlex-Coated Steel

Case Width

42mm

Case Thickness

10.5mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

110m

Dial Color

Champagne

Jewels

18j

Frequency

21,600 bph

Power Reserve

45 hours

Year

1995

Related Models

• Seiko 6331-316
• Seiko 6675-384
• Seiko 4418-843
• Seiko 7132-682
• Seiko 3849-987
• Seiko 4548-228
• Seiko 6290-156
• Seiko 4478-999
• Seiko 3849-690
• Seiko 5267-771
• Seiko 6285-733
• Seiko 7158-333