Seiko Cal. 6640 - 168

The Seiko 6640-168 represents an important milestone in Seiko's 1967 lineup. With its 21mm lug width and 8.5mm profile, it sits comfortably on most wrists. [seikata-wm-82b8f3dbdc9b]

Also known as: Baby Tuna

Specifications

Movement

Hand-Winding

Case Material

Gold-Plated

Case Width

44mm

Case Thickness

8.5mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

170m

Dial Color

Navy

Jewels

26j

Frequency

36,000 bph

Power Reserve

45 hours

Year

1967

Related Models

• Seiko 6691-642
• Seiko 7115-247
• Seiko 7094-534
• Seiko 6243-516
• Seiko 6384-846
• Seiko 3861-411
• Seiko 7154-418
• Seiko 7123-184
• Seiko 4596-957
• Seiko 4480-273
• Seiko 3887-217
• Seiko 4418-233