Seiko Cal. 4420 - 310

This Spring Drive model from 1984 features a 40mm Stainless Steel case. It features a Blue Sunburst dial protected by a Hardlex crystal and offers 140m of water resistance. [seikata-wm-7dc5ab1ea686]

Also known as: Sportsmatic, Sea Horse

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

40mm

Case Thickness

13.3mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

140m

Dial Color

Blue Sunburst

Jewels

34j

Frequency

28,800 bph

Power Reserve

71 hours

Year

1984

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