Seiko Cal. 6640 - 408

The Seiko 6640-408 represents an important milestone in Seiko's 1993 lineup. With its 20mm lug width and 15.5mm profile, it sits comfortably on most wrists. [seikata-wm-fcf45f458b2f]

Also known as: Silverwave, Crown

Specifications

Movement

Automatic

Case Material

Gold-Plated

Case Width

44mm

Case Thickness

15.5mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

140m

Dial Color

Silver

Jewels

23j

Frequency

28,800 bph

Power Reserve

45 hours

Year

1993

Related Models

• Seiko 7119-654
• Seiko 0715-813
• Seiko 6123-264
• Seiko 5613-306
• Seiko 4462-970
• Seiko 6383-347
• Seiko 0798-139
• Seiko 6278-194
• Seiko 6267-975
• Seiko 5260-646
• Seiko 5627-828
• Seiko 5651-630