Seiko Cal. 4421 - 347

This Spring Drive model from 1978 features a 40mm Two-Tone case. It features a Black dial protected by a Acrylic crystal and offers 40m of water resistance. [seikata-wm-7ad6761a25f5]

Also known as: Sumo

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

40mm

Case Thickness

11.7mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

40m

Dial Color

Black

Jewels

26j

Frequency

21,600 bph

Power Reserve

69 hours

Year

1978

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