Seiko Cal. 4421 - 139

This Hand-Winding model from 1988 features a 37mm PVD Black case. With its 20mm lug width and 10.0mm profile, it sits comfortably on most wrists. [seikata-wm-30de729eb073]

Also known as: Tuna, Baby Tuna

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

37mm

Case Thickness

10.0mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

70m

Dial Color

Cream

Jewels

20j

Frequency

28,800 bph

Power Reserve

71 hours

Year

1988

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