Seiko Cal. 5231 - 310

This Hand-Winding model from 1997 features a 40mm Hardlex-Coated Steel case. With its 18mm lug width and 10.5mm profile, it sits comfortably on most wrists. [seikata-wm-bc700fef9a6a]

Also known as: Crown

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

40mm

Case Thickness

10.5mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

40m

Dial Color

White

Jewels

25j

Frequency

21,600 bph

Power Reserve

38 hours

Year

1997

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