Seiko Cal. 4431 - 413

This Automatic model from 1986 features a 37mm Hardlex-Coated Steel case. Powered by the 4431 caliber with 24j jewels beating at 21,600 bph, it delivers a 65 hours power reserve. [seikata-wm-f85ce10cc5e6]

Also known as: Tuna, Sea Horse

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

37mm

Case Thickness

11.3mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

40m

Dial Color

Blue Sunburst

Jewels

24j

Frequency

21,600 bph

Power Reserve

65 hours

Year

1986

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