Seiko Cal. 6688 - 640

The 6688-640 is a sought-after Automatic piece from Seiko's golden era. Powered by the 6688 caliber with 22j jewels beating at 21,600 bph, it delivers a 71 hours power reserve. [seikata-wm-6f95316c8fc6]

Also known as: Shogun

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

44mm

Case Thickness

11.8mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

30m

Dial Color

Black

Jewels

22j

Frequency

21,600 bph

Power Reserve

71 hours

Year

1987

Related Models

• Seiko 6640-489
• Seiko 7065-597
• Seiko 0771-290
• Seiko 7021-958
• Seiko 4460-345
• Seiko 4519-234
• Seiko 4588-826
• Seiko 0725-279
• Seiko 6671-723
• Seiko 3812-422
• Seiko 3868-283
• Seiko 0762-517