Seiko Cal. 6641 - 580

The Seiko 6641-580 represents an important milestone in Seiko's 1986 lineup. With its 20mm lug width and 14.8mm profile, it sits comfortably on most wrists. [seikata-wm-83ec671d589e]

Also known as: Sumo, UFO

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

45mm

Case Thickness

14.8mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

40m

Dial Color

Navy

Jewels

17j

Frequency

21,600 bph

Power Reserve

50 hours

Year

1986

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