Seiko Cal. 6640 - 402

The 6640-402 is a sought-after Hand-Winding piece from Seiko's golden era. The Inner Rotating bezel and 44mm case give it a distinctive presence on the wrist. [seikata-wm-7398023a8207]

Also known as: UFO, Arnie

Specifications

Movement

Hand-Winding

Case Material

Gold-Plated

Case Width

44mm

Case Thickness

13.8mm

Lug Width

22mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

160m

Dial Color

Silver

Jewels

34j

Frequency

36,000 bph

Power Reserve

64 hours

Year

1976

Related Models

• Seiko 0749-592
• Seiko 6254-169
• Seiko 6315-992
• Seiko 6696-462
• Seiko 6116-951
• Seiko 5237-693
• Seiko 5257-629
• Seiko 6256-454
• Seiko 7063-498
• Seiko 0766-954
• Seiko 6168-857
• Seiko 7027-614