Seiko Cal. 4423 - 840

The 4423-840 is a sought-after Spring Drive piece from Seiko's golden era. It features a Blue Sunburst dial protected by a Hardlex crystal and offers 30m of water resistance. [seikata-wm-9bc2068500ed]

Also known as: Helmet, Silverwave

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

39mm

Case Thickness

13.2mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

30m

Dial Color

Blue Sunburst

Jewels

26j

Frequency

28,800 bph

Power Reserve

40 hours

Year

1978

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