Seiko Cal. 4431 - 311

This Spring Drive model from 1978 features a 44mm Titanium case. With its 19mm lug width and 8.9mm profile, it sits comfortably on most wrists. [seikata-wm-c2fec075b080]

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

44mm

Case Thickness

8.9mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

50m

Dial Color

Navy

Jewels

36j

Frequency

36,000 bph

Power Reserve

66 hours

Year

1978

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