Seiko Cal. 6640 - 665

The Seiko 6640-665 represents an important milestone in Seiko's 1999 lineup. With its 19mm lug width and 11.1mm profile, it sits comfortably on most wrists. [seikata-wm-99d982c53568]

Also known as: Baby Tuna

Specifications

Movement

Quartz

Case Material

Titanium

Case Width

39mm

Case Thickness

11.1mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

70m

Dial Color

Silver

Jewels

35j

Frequency

21,600 bph

Power Reserve

55 hours

Year

1999

Related Models

• Seiko 6197-922
• Seiko 7117-710
• Seiko 0759-725
• Seiko 7045-704
• Seiko 7156-737
• Seiko 6327-471
• Seiko 6264-899
• Seiko 5299-387
• Seiko 6365-413
• Seiko 5664-925
• Seiko 6387-841
• Seiko 6243-323