Seiko Cal. 5231 - 509

The Seiko 5231-509 represents an important milestone in Seiko's 1986 lineup. With its 19mm lug width and 12.8mm profile, it sits comfortably on most wrists. [seikata-wm-f55c2cc26cc3]

Also known as: Navigator, Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

36mm

Case Thickness

12.8mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

200m

Dial Color

White

Jewels

21j

Frequency

36,000 bph

Power Reserve

39 hours

Year

1986

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