Seiko Cal. 6643 - 664

The Seiko 6643-664 represents an important milestone in Seiko's 1990 lineup. Powered by the 6643 caliber with 20j jewels beating at 28,800 bph, it delivers a 49 hours power reserve. [seikata-wm-1558e2ea48ea]

Also known as: Sea Horse, Emperor

Specifications

Movement

Quartz

Case Material

Two-Tone

Case Width

41mm

Case Thickness

15.0mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

100m

Dial Color

Silver

Jewels

20j

Frequency

28,800 bph

Power Reserve

49 hours

Year

1990

Related Models

• Seiko 7028-386
• Seiko 4572-735
• Seiko 5698-709
• Seiko 6682-433
• Seiko 6688-431
• Seiko 6375-955
• Seiko 7137-856
• Seiko 7055-561
• Seiko 6317-347
• Seiko 6339-152
• Seiko 0769-413
• Seiko 5653-811