Seiko Cal. 4431 - 405

The 4431-405 is a sought-after Spring Drive piece from Seiko's golden era. With its 21mm lug width and 9.8mm profile, it sits comfortably on most wrists. [seikata-wm-fc3241aa0f0a]

Also known as: Turtle, World Timer

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

42mm

Case Thickness

9.8mm

Lug Width

21mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

90m

Dial Color

Silver

Jewels

29j

Frequency

36,000 bph

Power Reserve

41 hours

Year

1985

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