Seiko Cal. 6640 - 190

This Spring Drive model from 1998 features a 41mm Hardlex-Coated Steel case. With its 21mm lug width and 15.9mm profile, it sits comfortably on most wrists. [seikata-wm-984440863fd1]

Also known as: Sumo

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

41mm

Case Thickness

15.9mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

50m

Dial Color

Silver

Jewels

26j

Frequency

21,600 bph

Power Reserve

57 hours

Year

1998

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