Seiko Cal. 6640 - 330

The Seiko 6640-330 represents an important milestone in Seiko's 1998 lineup. With its 20mm lug width and 11.8mm profile, it sits comfortably on most wrists. [seikata-wm-a5ccb9daa593]

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

41mm

Case Thickness

11.8mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

190m

Dial Color

Blue Sunburst

Jewels

19j

Frequency

21,600 bph

Power Reserve

41 hours

Year

1998

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