Seiko Cal. 6640 - 947

This Quartz model from 1978 features a 44mm Two-Tone case. Powered by the 6640 caliber with 35j jewels beating at 21,600 bph, it delivers a 72 hours power reserve. [seikata-wm-e412c5ff5a6d]

Also known as: Samurai

Specifications

Movement

Quartz

Case Material

Two-Tone

Case Width

44mm

Case Thickness

11.8mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

140m

Dial Color

Blue Sunburst

Jewels

35j

Frequency

21,600 bph

Power Reserve

72 hours

Year

1978

Related Models

• Seiko 6237-922
• Seiko 6283-906
• Seiko 7167-687
• Seiko 4470-961
• Seiko 4559-108
• Seiko 4510-654
• Seiko 4540-672
• Seiko 0748-223
• Seiko 7020-241
• Seiko 6133-944
• Seiko 4551-864
• Seiko 6388-152