Seiko Cal. 4431 - 406

Released in 1971, the Cal. 4431 with design code 406 was part of Seiko's domestic market collection. Powered by the 4431 caliber with 31j jewels beating at 21,600 bph, it delivers a 50 hours power reserve. [seikata-wm-ad2c0944df4b]

Also known as: UFO

Specifications

Movement

Kinetic

Case Material

Two-Tone

Case Width

46mm

Case Thickness

14.3mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

180m

Dial Color

Burgundy

Jewels

31j

Frequency

21,600 bph

Power Reserve

50 hours

Year

1971

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