Seiko Cal. 6640 - 748

The Seiko 6640-748 represents an important milestone in Seiko's 1996 lineup. With its 19mm lug width and 12.8mm profile, it sits comfortably on most wrists. [seikata-wm-fb0a735a8a2d]

Also known as: Helmet, Emperor

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

36mm

Case Thickness

12.8mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

60m

Dial Color

White

Jewels

20j

Frequency

21,600 bph

Power Reserve

48 hours

Year

1996

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