Seiko Cal. 4420 - 910

Released in 1976, the Cal. 4420 with design code 910 was part of Seiko's domestic market collection. It features a Silver dial protected by a Hardlex crystal and offers 140m of water resistance. [seikata-wm-246d72fe10af]

Also known as: Helmet

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

37mm

Case Thickness

15.8mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

140m

Dial Color

Silver

Jewels

36j

Frequency

36,000 bph

Power Reserve

43 hours

Year

1976

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