Seiko Cal. 6640 - 464

The Seiko 6640-464 represents an important milestone in Seiko's 1999 lineup. With its 20mm lug width and 13.2mm profile, it sits comfortably on most wrists. [seikata-wm-64e04961b9f8]

Also known as: Sumo, Bullhead

Specifications

Movement

Solar

Case Material

PVD Black

Case Width

46mm

Case Thickness

13.2mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

50m

Dial Color

Silver

Jewels

31j

Frequency

36,000 bph

Power Reserve

50 hours

Year

1999

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