Seiko Cal. 4420 - 150

Released in 1976, the Cal. 4420 with design code 150 was part of Seiko's domestic market collection. It features a Black dial protected by a Acrylic crystal and offers 180m of water resistance. [seikata-wm-8aaf12a2fa88]

Also known as: Bellmatic, Baby Tuna

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

38mm

Case Thickness

12.5mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

180m

Dial Color

Black

Jewels

22j

Frequency

28,800 bph

Power Reserve

71 hours

Year

1976

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