Seiko Cal. 5668 - 840

The 5668-840 is a sought-after Spring Drive piece from Seiko's golden era. With its 21mm lug width and 10.4mm profile, it sits comfortably on most wrists. [seikata-wm-d8e201f8346d]

Also known as: Sumo, Bullhead

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

40mm

Case Thickness

10.4mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

50m

Dial Color

Cream

Jewels

32j

Frequency

36,000 bph

Power Reserve

39 hours

Year

1979

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