Seiko Cal. 4431 - 649

The Seiko 4431-649 represents an important milestone in Seiko's 1970 lineup. With its 18mm lug width and 9.5mm profile, it sits comfortably on most wrists. [seikata-wm-0d360feb6007]

Also known as: UFO, Navigator

Specifications

Movement

Automatic

Case Material

Titanium

Case Width

45mm

Case Thickness

9.5mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

80m

Dial Color

Blue Sunburst

Jewels

22j

Frequency

21,600 bph

Power Reserve

60 hours

Year

1970

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