Seiko Cal. 6620 - 371

This Spring Drive model from 1991 features a 42mm Stainless Steel case. It features a White dial protected by a Hardlex crystal and offers 50m of water resistance. [seikata-wm-14bbefe9229a]

Also known as: Helmet

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

42mm

Case Thickness

10.1mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

50m

Dial Color

White

Jewels

23j

Frequency

21,600 bph

Power Reserve

57 hours

Year

1991

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