Seiko Cal. 4431 - 521

This Kinetic model from 1982 features a 40mm PVD Black case. With its 21mm lug width and 14.3mm profile, it sits comfortably on most wrists. [seikata-wm-d11b886fa231]

Also known as: Baby Tuna

Specifications

Movement

Kinetic

Case Material

PVD Black

Case Width

40mm

Case Thickness

14.3mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

120m

Dial Color

Blue Sunburst

Jewels

31j

Frequency

28,800 bph

Power Reserve

66 hours

Year

1982

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