Seiko Cal. 5635 - 668

The Seiko 5635-668 represents an important milestone in Seiko's 1998 lineup. With its 18mm lug width and 9.6mm profile, it sits comfortably on most wrists. [seikata-wm-7e9cc7b0b6d0]

Also known as: Sumo, UFO

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

40mm

Case Thickness

9.6mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

110m

Dial Color

Navy

Jewels

31j

Frequency

36,000 bph

Power Reserve

68 hours

Year

1998

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