Seiko Cal. 4431 - 306

Released in 1965, the Cal. 4431 with design code 306 was part of Seiko's domestic market collection. With its 21mm lug width and 10.0mm profile, it sits comfortably on most wrists. [seikata-wm-8bb8889aff7f]

Also known as: Sportsmatic, Navigator

Specifications

Movement

Automatic

Case Material

Stainless Steel

Case Width

38mm

Case Thickness

10.0mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

80m

Dial Color

Navy

Jewels

30j

Frequency

36,000 bph

Power Reserve

66 hours

Year

1965

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