Seiko Cal. 5240 - 442

This Spring Drive model from 1988 features a 40mm Hardlex-Coated Steel case. With its 21mm lug width and 8.4mm profile, it sits comfortably on most wrists. [seikata-wm-19e05de5cb3d]

Also known as: Samurai, Sumo

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

40mm

Case Thickness

8.4mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

190m

Dial Color

Silver

Jewels

32j

Frequency

36,000 bph

Power Reserve

65 hours

Year

1988

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