Seiko Cal. 5681 - 540

The Seiko 5681-540 represents an important milestone in Seiko's 1979 lineup. With its 20mm lug width and 12.5mm profile, it sits comfortably on most wrists. [seikata-wm-89a540abc553]

Also known as: Navigator, Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

35mm

Case Thickness

12.5mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

100m

Dial Color

Cream

Jewels

33j

Frequency

21,600 bph

Power Reserve

58 hours

Year

1979

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