Seiko Cal. 4431 - 415

This Spring Drive model from 1981 features a 46mm Hardlex-Coated Steel case. The Bidirectional bezel and 46mm case give it a distinctive presence on the wrist. [seikata-wm-068571a54b37]

Also known as: Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

46mm

Case Thickness

9.1mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

60m

Dial Color

Champagne

Jewels

23j

Frequency

21,600 bph

Power Reserve

63 hours

Year

1981

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