Seiko Cal. 4431 - 360

This Spring Drive model from 1967 features a 37mm Titanium case. Powered by the 4431 caliber with 35j jewels beating at 21,600 bph, it delivers a 47 hours power reserve. [seikata-wm-226441b2522c]

Also known as: UFO

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

37mm

Case Thickness

14.1mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

200m

Dial Color

Black

Jewels

35j

Frequency

21,600 bph

Power Reserve

47 hours

Year

1967

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